diff --git a/subjects/java/piscine/AdventureAbstract/README.md b/subjects/java/piscine/AdventureAbstract/README.md
index d4ab82e8b..0f661ab91 100644
--- a/subjects/java/piscine/AdventureAbstract/README.md
+++ b/subjects/java/piscine/AdventureAbstract/README.md
@@ -2,23 +2,23 @@
 
 ### Instructions
 
-Let's change some things : make the `Character` as `abstract`. You can now try to instantiate a Character object, it will fail :)
+Let's change things a bit: make the `Character` as `abstract`. You can now try to instantiate a Character object, it will fail :)
 
-Change the `attack` and `takeDamage` methods : put them as `abstract` too.
+Change `attack` and `takeDamage` methods : make them `abstract` too.
 
-Now, if you try to launch some example, it will fail. Indeed, you need to implement both methods in all subclasses. Do this as follow : 
+Now, if you try to launch an example, it will fail. Indeed, you need to implement both methods in all subclasses. Do this as follows : 
 
-Remember that in all cases, the `currentHealth` should not be lower than 0.
+Remember that in all cases, `currentHealth` should not be lower than 0.
 
 * For Monster class : 
-  * the `attack` method should deal 7 damages to the character as parameter.
-  * the `takeDamage` method should take 80% of all the damages, rounded to the inferior integer.
+  * the method `attack` should make 7 damages to the character in parameter.
+  * the method `takeDamage` should take 80% of all the damages, rounded to the inferior integer.
 * For the `Sorcerer` class : 
-  * the `attack` method should heal itself (using the `heal` method) then deal 10 damages to the character as parameter.
-  * the `takeDamage` method should take all the damages.
+  * the method `attack` should heal itself (using the `heal` method) then make 10 damages to the character in parameter.
+  * the method `takeDamage` should take all the damages.
 * For the `Templar` class : 
-  * the `attack` method should heal itself (using the `heal` method) then deal 6 damages to the character as parameter.
-  * the `takeDamage` method should take the damage as parameter minus the shield value.
+  * the method `attack` should heal itself (using the method `heal`) then make 6 damages to the character in parameter.
+  * the method `takeDamage` should take the damage given in parameter minus the shield value.
 
 ### Usage
 
diff --git a/subjects/java/piscine/AdventureCharacter/README.md b/subjects/java/piscine/AdventureCharacter/README.md
index e29fda819..8d5449ce5 100644
--- a/subjects/java/piscine/AdventureCharacter/README.md
+++ b/subjects/java/piscine/AdventureCharacter/README.md
@@ -7,18 +7,18 @@ In the following quest, we will work with the same files and classes. You should
 Create a file `Character.java`.
 
 Create a public class named `Character`.  
-The class must contains three properties : 
+The class must contain three properties : 
 * maxHealth (int) : with a getter and no setter. This property is not updatable (`final` keyword).
 * currentHealth (int) : with a getter and no setter.
 * name (String) : with a getter and no setter. This property is not updatable (`final` keyword).
 
-Create a constructor with two parameters (name and maxHealth) : the currentHealth is initialized with the maxHealth value.
+Create a constructor with two parameters (name and maxHealth) : the currentHealth is initialized with the value of maxHealth.
 
-Rewrite the `toString`, that will have the format `<name> : <currentHealth>/<maxHealth>`. If the currentHealth is 0, the format is `<name> : KO`.
+Override `toString` method, Must have the format `<name> : <currentHealth>/<maxHealth>`. If the currentHealth is 0, the format is `<name> : KO`.
 
 Implement two methods : 
-* `takeDamage`, with an integer parameter, that will remove the amount in parameter to the `currentHealth`. The current health can't be lower than 0.
-* `attack`, with a `Character` parameter, that will call `takeDamage` of the parameter with a default value : `9`.
+* `takeDamage`, with an integer parameter, that will subtract the amount in parameter from `currentHealth`. `currentHealth` can't be lower than 0.
+* `attack`, with a parameter of type `Character`, that will call `takeDamage` of the parameter with a default value : `9`.
 
 ### Usage
 
diff --git a/subjects/java/piscine/AdventureInterface/README.md b/subjects/java/piscine/AdventureInterface/README.md
index 8eea1194d..465ab1659 100644
--- a/subjects/java/piscine/AdventureInterface/README.md
+++ b/subjects/java/piscine/AdventureInterface/README.md
@@ -2,13 +2,13 @@
 
 ### Instructions
 
-We will now use a new principle : the interfaces.
+We will now use a new principle : interfaces.
 
 Let's create an interface `Tank` in a file `Tank.java`.
 It has one method : `getShield` that returns an integer.
 
 Create another interface `Healer` in a file `Healer.java`. It has two methods : 
-* `heal` which takes a `Character` as parameter and return nothing.
+* `heal` which takes a `Character` as parameter and returns nothing.
 * `getHealCapacity` which returns an integer.
 
 ### Notions
diff --git a/subjects/java/piscine/AdventureMonster/README.md b/subjects/java/piscine/AdventureMonster/README.md
index 6920cf959..66e1db7d8 100644
--- a/subjects/java/piscine/AdventureMonster/README.md
+++ b/subjects/java/piscine/AdventureMonster/README.md
@@ -6,9 +6,9 @@ Create a new class `Monster` in a new file `Monster.java`.
 
 This class inherits from `Character`.
 
-It has one constructor, with the same 2 parameters (the `name` and the `maxHealth`) as `Character`.
+It has one constructor, with the same parameters as `Character` (`name` and `maxHealth`).
 
-You need to overwrite the `toString` method with the following format : 
+You need to override `toString` method, use the following format : 
 * if the monster is still alive : `<name> is a monster with <currentHealth> HP`.
 * Otherwise : `<name> is a monster and is dead`.
 
diff --git a/subjects/java/piscine/AdventureSorcerer/README.md b/subjects/java/piscine/AdventureSorcerer/README.md
index b19779cbc..8592b0eb9 100644
--- a/subjects/java/piscine/AdventureSorcerer/README.md
+++ b/subjects/java/piscine/AdventureSorcerer/README.md
@@ -13,10 +13,10 @@ It has a constructor with three parameters :
 
 From the `Healer` interface : 
 * `getHealCapacity` returns the property `healCapacity`
-* `heal` add `healCapacity` to the currentHealth of the `Character` in parameter. Beware that the `currentHealth` can't be greater the `maxHealth`. You may need to change the accessibility of the `currentHealth` param in the `Character` to be able to update the value.
+* `heal` adds `healCapacity` to the currentHealth of the `Character` in parameter. Beware that `currentHealth` can't be greater the `maxHealth`. You may need to change the accessibility of the `currentHealth` attribute in `Character` class to be able to update the value.
 
-You will override the `toString` method with the following format : `<name> is a sorcerer with <currentHealth> HP. It can heal <healCapacity> HP.`
-If it's `currentHeal` is equal to 0, the format is `<name> is a dead sorcerer. So bad, it could heal <healCapacity> HP.`
+You will override `toString` method with the following format : `<name> is a sorcerer with <currentHealth> HP. It can heal <healCapacity> HP.`
+If its `currentHeal` is equal to 0, the format is `<name> is a dead sorcerer. So bad, it could heal <healCapacity> HP.`
 
 ### Usage
 
diff --git a/subjects/java/piscine/AdventureTemplar/README.md b/subjects/java/piscine/AdventureTemplar/README.md
index 73dc76110..abf7cf041 100644
--- a/subjects/java/piscine/AdventureTemplar/README.md
+++ b/subjects/java/piscine/AdventureTemplar/README.md
@@ -4,7 +4,7 @@
 
 We will now implement our second interface through a new class : `Templar` in a file named `Templar.java`.
 
-This class implements the `Healer` and the `Tank` interfaces and inherits from `Character`.  
+This class implements `Healer` and `Tank` interfaces and inherits from `Character`.  
 It has two new attributes :
 
 - a non modifiable integer `healCapacity`,
@@ -19,14 +19,14 @@ It has a constructor with four parameters :
 From the `Healer` interface :
 
 - `getHealCapacity` returns the property `healCapacity`
-- `heal` add `healCapacity` to the currentHealth of the `Character` in parameter. Beware that the `currentHealth` can't be greater the `maxHealth`.
+- `heal` adds `healCapacity` to the currentHealth of the `Character` in parameter. Beware that `currentHealth` can't be greater the `maxHealth`.
 
-From the `Tank` interface :
+From `Tank` interface :
 
-- `getShield` return the property `shield`.
+- `getShield` returns the property `shield`.
 
-You will override the `toString` method with the following format : `<name> is a strong Templar with <currentHealth> HP. It can heal <healCapacity> HP and has a shield of <shield>.`
-If it's `currentHeal` is equal to 0, the format is `<name> has been beaten, even with its <shield> shield. So bad, it could heal <healCapacity> HP.`
+You will override `toString` method with the following format : `<name> is a strong Templar with <currentHealth> HP. It can heal <healCapacity> HP and has a shield of <shield>.`
+If its `currentHeal` is equal to 0, the format is `<name> has been beaten, even with its <shield> shield. So bad, it could heal <healCapacity> HP.`
 
 ### Usage
 
diff --git a/subjects/java/piscine/AdventureUtils/README.md b/subjects/java/piscine/AdventureUtils/README.md
index 3bb11cfec..9878594ab 100644
--- a/subjects/java/piscine/AdventureUtils/README.md
+++ b/subjects/java/piscine/AdventureUtils/README.md
@@ -2,11 +2,11 @@
 
 ### Instructions
 
-Let's add some useful method to allow us to manipulate and monitor what happen with our characters.
+Let's add some useful methods to allow us to manipulate and monitor what happens with our characters.
 
 Firstly, let's add something to see all our characters in one call : 
-* Add a private static list of `Character`, `allCharacters`, which will contains all our characters. In the constructor, you need to add this new `Character` to this list.
-* Add a static method, `printStatus`, which take no parameters and will return a formatted String that will list all characters in `allCharaters`. The awaited format is as follow with new line at the end : 
+* Add a private static list of `Character`, `allCharacters`, which will contain all our characters. In the constructor, you need to add every new `Character` to this list.
+* Add a static method, `printStatus`, which takes no parameters and returns a formatted String that lists `allCharaters`. The awaited format is as follows with new line at the end : 
 ```
 ------------------------------------------
 Characters currently fighting : 
@@ -21,8 +21,8 @@ Nobody's fighting right now !
 ------------------------------------------
 ```
 
-Finally, add a static method, `fight`, which take two characters and returns the winner and the fight.  
-During the fight, the first one attack, then the second one, then the first, then the second and so on until one of them reaches 0 in its currentHealth. When one of them currentHealth reach, the other one is the winner.
+Finally, add a static method, `fight`, which takes two `Character` objects and returns the winner in the fight.  
+During the fight, the first one attacks, then the second one, then the first, then the second and so on until one of them reaches 0 in its currentHealth. When `currentHealth` for one of them reaches 0, the other one is the winner.
 
 ### Usage
 
diff --git a/subjects/java/piscine/AdventureWeapon/README.md b/subjects/java/piscine/AdventureWeapon/README.md
index 7968c0d71..4d0f9bb48 100644
--- a/subjects/java/piscine/AdventureWeapon/README.md
+++ b/subjects/java/piscine/AdventureWeapon/README.md
@@ -5,18 +5,18 @@
 We create now the weapon for our adventurers. Create a new class `Weapon` in a new file `Weapon.java`.
 
 It has two attributes : 
-* a String called `name` with a getter.
-* an integer called `damage` with a getter.
+* A String called `name` with a getter.
+* An integer called `damage` with a getter.
 
-The constructor has these 2 attributes as parameters.
+The constructor takes in both attributes as parameters.
 
-Let's overwrite the `toString` method for this class : it returns a string under the format `<name> deals <damage> damages`
+Let's override `toString` method for this class : it returns a string under the format `<name> deals <damage> damages`
 
 Now, add a weapon attribute to the `Character` class, in its constructor and in the constructor of all subclasses.
 
-In all subclasses, in the `attack` method, you need to use the `damage` when calling the `takeDamage` method. It the character has no weapon, use the previous defined damage per subclasses.
+In all subclasses, in `attack` method, you need to use `damage` when calling `takeDamage` method. If the character has no weapon, use the previous defined damage per subclasses.
  
-Update the `toString` method of all subclasses by using the concatenation of the current value with the following string : `He has the weapon <weapon.toString>`.
+Update `toString` method of all subclasses by using the concatenation of the current value with the following string : `He has the weapon <weapon.toString>`.
 
 ### Usage
 
diff --git a/subjects/java/piscine/ComputeArray/README.md b/subjects/java/piscine/ComputeArray/README.md
index 7b5756b3d..7be653832 100644
--- a/subjects/java/piscine/ComputeArray/README.md
+++ b/subjects/java/piscine/ComputeArray/README.md
@@ -4,11 +4,11 @@
 
 Create a file `ComputeArray.java`.
 
-Write a function `computeArray` that returns receives an array, and returns a new array with computed values.
+Write a function `computeArray` that receives an integer array, and returns a new array with computed values.
 
-- if the item is a multiple of 3, the item is multiplied by 5
-- if the item is a multiple of 3 + 1 (e.g. 1, 4, 7, ...), the item is incremented by 7
-- if the item is a multiple of 3 + 2 (e.g. 2, 5, 8, ...), the item stay as it is.
+- If the item is a multiple of 3, it is multiplied by 5
+- If the item is a multiple of 3 + 1 (e.g. 1, 4, 7, ...), it is incremented by 7
+- If the item is a multiple of 3 + 2 (e.g. 2, 5, 8, ...), it stays unchanged.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/FileSearch/README.md b/subjects/java/piscine/FileSearch/README.md
index 566eaaa18..b4643e5bf 100644
--- a/subjects/java/piscine/FileSearch/README.md
+++ b/subjects/java/piscine/FileSearch/README.md
@@ -5,7 +5,7 @@
 Create a file `FileSearch.java`.
 
 Write a function `searchFile` that returns the path of the file in parameter. You need to start searching from a folder named `documents` at the root of the current folder.  
-The file to search can contain a subfolder and the file can be in any of them.
+The file to search can be located inside nested subfolders.
 
 ### Expected Functions
 ```java
diff --git a/subjects/java/piscine/FormatDate/README.md b/subjects/java/piscine/FormatDate/README.md
index 369a2b4a5..be1a599a8 100644
--- a/subjects/java/piscine/FormatDate/README.md
+++ b/subjects/java/piscine/FormatDate/README.md
@@ -4,7 +4,7 @@
 
 Create a file `FormatDate.java`.
 
-Write a function `formatToFullText` that returns a formatted string using the date as parameter. The awaited format is `Le 22 aoû. de l'an 2021 à 13h25m et 46s`    
+Write a function `formatToFullText` that returns a formatted string using the date as parameter. The awaited format is `Le 22 août de l'an 2021 à 13h25m et 46s`    
 Write a function `formatSimple` that returns a formatted string using the date as parameter. The awaited format is `febbraio 13 22`  
 Write a function `formatIso` that returns a formatted string using the time as parameter. The awaited format is `16:18:56.8495847`
 
diff --git a/subjects/java/piscine/KeepTheChange/README.md b/subjects/java/piscine/KeepTheChange/README.md
index 919e5f5b3..edc231946 100644
--- a/subjects/java/piscine/KeepTheChange/README.md
+++ b/subjects/java/piscine/KeepTheChange/README.md
@@ -6,10 +6,10 @@ Create a file `KeepTheChange.java`.
 
 Write a function `computeChange` that returns the list of coins that compose the change.  
 As parameters, we have : 
-* the amount to decompose in different coins
-* the set of existing coins
+* The amount to decompose into different coins
+* The set of existing coins
 
-The awaiting solution is the best solution, so must have the minimum of coins.  
+The awaited solution is the best solution, so must have the minimum number of coins.  
 The tests are choosen to have an unique solution.
 
 ### Expected Functions
diff --git a/subjects/java/piscine/ListEquals/README.md b/subjects/java/piscine/ListEquals/README.md
index 60141ba94..39765556e 100644
--- a/subjects/java/piscine/ListEquals/README.md
+++ b/subjects/java/piscine/ListEquals/README.md
@@ -4,7 +4,7 @@
 
 Create a file `ListEquals.java`.
 
-Write a function `areListsEqual` that returns true if the lists as parameters are equals. Returns false otherwise.
+Write a function `areListsEqual` that returns true if the lists in parameters are equal. Returns false otherwise.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/MapInventory/README.md b/subjects/java/piscine/MapInventory/README.md
index fe1334a23..da82002a5 100644
--- a/subjects/java/piscine/MapInventory/README.md
+++ b/subjects/java/piscine/MapInventory/README.md
@@ -8,9 +8,9 @@ Create a file `MapInventory.java`.
 
 Write two functions:
 
-Write a function `getProductPrice` that takes a map of product IDs and their corresponding prices, along with a product ID as parameters, and returns the price of the specified product. If the product ID is not present in the map, the function should return `-1`.
+Write a function `getProductPrice` that takes in parameters a map of product IDs and their corresponding prices, along with a product ID, and returns the price of the specified product. If the product ID is not present in the map, the function should return `-1`.
 
-Write a function `getProductIdsByPrice` that takes a map of product IDs and their corresponding prices, along with a price as a parameter, and returns a list of product IDs that have the given price. If no products are found with the specified price, the function should return an empty list.
+Write a function `getProductIdsByPrice` that takes a map of product IDs and their corresponding prices, along with a price as parameter, and returns a list of product IDs that have the given price. If no products are found for the specified price, the function should return an empty list.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/Observer/README.md b/subjects/java/piscine/Observer/README.md
index c9f31d54b..2d30bc675 100644
--- a/subjects/java/piscine/Observer/README.md
+++ b/subjects/java/piscine/Observer/README.md
@@ -46,16 +46,16 @@ Here is the matching class diagram. Create the matching classes in the matching
 Here is the description : 
 * For `ValuePublisher` :
   * `updateState` calls the `updateState` method of all observers.
-  * `subscribe` should add the observer in the list of observers.
-  * `unsubscribe` should remove the observer of the list of observers.
+  * `subscribe` should add the observer to the list of observers.
+  * `unsubscribe` should remove the observer from the list of observers.
 * For `BinaryBaseObserver` :
-  * `updateState` should add the binary String of the value in parameter to the list of events (e.g. for 13, should add "1101")
+  * `updateState` should add the binary String representation of its parameter to the list of events (e.g. for 13, should add "1101")
   * `getEvents` should return the list of events.
 * For `DecimalBaseObserver` :
-  * `updateState` should add the decimal String of the value in parameter to the list of events (e.g. for 13, should add "13")
+  * `updateState` should add the decimal String representation of its parameter to the list of events (e.g. for 13, should add "13")
   * `getEvents` should return the list of events.
 * For `HexaBaseObserver` :
-  * `updateState` should add the hexadecimal String of the value in parameter to the list of events (e.g. for 13, should add "d")
+  * `updateState` should add the hexadecimal String representation of its parameter to the list of events (e.g. for 13, should add "d")
   * `getEvents` should return the list of events.
 
 ### Usage
diff --git a/subjects/java/piscine/Palindrome/README.md b/subjects/java/piscine/Palindrome/README.md
index a44a6827c..d9356b33b 100644
--- a/subjects/java/piscine/Palindrome/README.md
+++ b/subjects/java/piscine/Palindrome/README.md
@@ -4,7 +4,7 @@
 
 Create a file `Palindrome.java`.
 
-Write a function `isPalindrome` that returns true if the String as parameter is a palindrome, i.e. can be read in both direction (e.g. 'kayak').
+Write a function `isPalindrome` that returns true if the String in parameter is a palindrome, i.e. Have same spelling backwards and forwards (e.g. 'kayak').
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/RegexReplace/README.md b/subjects/java/piscine/RegexReplace/README.md
index 5762717f2..5e4fabe59 100644
--- a/subjects/java/piscine/RegexReplace/README.md
+++ b/subjects/java/piscine/RegexReplace/README.md
@@ -4,11 +4,10 @@
 
 Create a file `RegexReplace.java`.
 
-Write a function `removeUnits` that returns the string where the units `cm` and `€` is removed if it followed directly a number and followed by a space.  
-Write a function `removeFeminineAndPlural` that returns the string where the mark of feminine and plural is removed from word : 
- - if a word ends a mark of plural (with s or x), remove it.
- - if it ends with an e or if the e is followed by the mark of plural, remove the it
- - if it ends with `le` following `el` (or if `le` is followed by plural), remove it.
+Write a function `removeUnits` that returns the string where the units `cm` and `€` are removed if they follow directly a number and followed by a space.
+Write a function `obfuscateEmail` that returns a string where parts of email addresses are replaced by '*' if they follow the rules below:
+- Hide from the username any character next to `-`,  `.` or `_` if they exist. Otherwise, hide 3 characters from the username if its length > 3
+- If the remaining part after `@` is in the format `@<third level domain>.<second level domain>.<top level domain>`, then hide the third and top level domains, otherwise hide the second level domain and the top level domain if it is not included in `.com`, `.org` and `.net`.
 
 ### Expected Functions
 ```java
@@ -17,7 +16,7 @@ public class RegexReplace {
         // your code here
     }
     
-    public static String removeFeminineAndPlural(String s) {
+    public static String obfuscateEmail(String s) {
         // your code here
     }
 }
@@ -35,7 +34,10 @@ public class ExerciseRunner {
         System.out.println(RegexReplace.removeUnits("32cm et 50€"));
         System.out.println(RegexReplace.removeUnits("32 cm et 50 €"));
         System.out.println(RegexReplace.removeUnits("32cms et 50€!"));
-        System.out.println(RegexReplace.removeFeminineAndPlural("le lapin joue à la belle balle avec des animaux rigolos pour gagner les billes bleues"));
+        
+        System.out.println(RegexReplace.obfuscateEmail("john.doe@example.com"));
+        System.out.println(RegexReplace.obfuscateEmail("jann@example.co.org"));
+        System.out.println(RegexReplace.obfuscateEmail("jackob@example.fr"));
     }
 }
 ```
@@ -48,6 +50,9 @@ $ java -cp build ExerciseRunner
 32 cm et 50 €
 32cms et 50€!
 l lapin jou à la bel ball avec d animau rigolo pour gagner l bill bleu
+joh****@*******.com
+jan*@*******.co.***
+jac***@*******.**
 $ 
 ```
 
diff --git a/subjects/java/piscine/Singleton/README.md b/subjects/java/piscine/Singleton/README.md
index b2129c457..3d21f34cc 100644
--- a/subjects/java/piscine/Singleton/README.md
+++ b/subjects/java/piscine/Singleton/README.md
@@ -4,7 +4,7 @@
 
 In this quest, we will implement some design patterns.
 
-For first, we will implement the singleton pattern.
+At first, we will implement the singleton pattern.
 
 ```mermaid
 classDiagram
@@ -20,7 +20,7 @@ Excalibur <-- Excalibur
 
 Here is the matching class diagram. Create the matching class in the matching file.
 
-When calling the getInstance method, an instance of Excalibur with name "Sword"
+When calling `getInstance` method, an instance of Excalibur with name "Sword" should be returned.
 
 ### Usage
 
diff --git a/subjects/java/piscine/StarConstructors/README.md b/subjects/java/piscine/StarConstructors/README.md
index 8323903df..b589d8692 100644
--- a/subjects/java/piscine/StarConstructors/README.md
+++ b/subjects/java/piscine/StarConstructors/README.md
@@ -4,12 +4,12 @@
 
 We will now add two constructors :
 
-* The default one, with no parameter which inits the properties to the following values :
+* The default one, with no parameters which initialises the properties with following values :
     * `x` : `0.0`
     * `y` : `0.0`
     * `z` : `0.0`
     * `name` : `"Soleil"`
-* The second one take four parameters and sets the values of `name`, `x`, `y` and `z`.
+* The second one takes four parameters and sets the values of `name`, `x`, `y` and `z`.
 
 ### Usage
 
diff --git a/subjects/java/piscine/StarGalaxy/README.md b/subjects/java/piscine/StarGalaxy/README.md
index ccb4f9724..60e14c8b1 100644
--- a/subjects/java/piscine/StarGalaxy/README.md
+++ b/subjects/java/piscine/StarGalaxy/README.md
@@ -6,9 +6,9 @@ Create a new class `Galaxy` in a file named `Galaxy.java`.
 
 It has one private property : `celestialObjects` of type `List<CelestialObject>`.
 
-It has one constructor with no parameters, which instantiate an empty list in the `celestialObjects` property.
+It has one constructor with no parameters, which initialises `celestialObjects` property with an empty list.
 
-We add a getter for the `celestialObjects` property (`getCelestialObjects`).
+We add a getter for `celestialObjects` property (`getCelestialObjects`).
 
 We create a new method `addCelestialObject` with a `CelestialObject` argument. This method adds the object in parameter to the `celestialObjects` list.
 
diff --git a/subjects/java/piscine/StarMass/README.md b/subjects/java/piscine/StarMass/README.md
index 6e1fcc034..b26aaea68 100644
--- a/subjects/java/piscine/StarMass/README.md
+++ b/subjects/java/piscine/StarMass/README.md
@@ -2,12 +2,12 @@
 
 ### Instructions
 
-For this last exercise, let's compute the mass of all objects in a galaxy, according their type.
+For this last exercise, let's compute the mass of all objects in a galaxy, according to their type.
 
-Firstly, let's add a mass property (it will be an integer) to all objects. I let you guess in which class to put it ;)  
+Firstly, let's add a mass property (it will be an integer) to all objects. I let you guess the class where to add it ;)
 You need to add the getter and setter for this property too. You will need to add a mass argument to all the constructors.
 
-In the `Galaxy` class, we will add a new method `computeMassRepartition` which returns a Map. This map will have for key the Strings `Star`, `Planet` or `Other`. The values will be the sum of the mass of the object by their type.
+In the `Galaxy` class, we will add a new method `computeMassRepartition` which returns a Map. This map will have as keys the Strings `Star`, `Planet` or `Other`. The values will be the sum of the mass of the objects by their type.
 
 ### Usage
 
diff --git a/subjects/java/piscine/StarOverride/README.md b/subjects/java/piscine/StarOverride/README.md
index 280195089..696cc4af5 100644
--- a/subjects/java/piscine/StarOverride/README.md
+++ b/subjects/java/piscine/StarOverride/README.md
@@ -10,9 +10,9 @@ In the `Star` class, let's add a new constructor with the following arguments :
 * the `magnitude`  
 It calls the constructor of the superclass `CelestialObject`.
 
-We will override the `hashCode` and `equals`, using the `magnitude` property.
+We will override `hashCode` and `equals` methods, using `magnitude` property.
 
-Finally, we rewrite the `toString` method. The returned String must have the following format : `<name> shines at the <magnitude> magnitude`
+Finally, we override `toString` method. The returned String must have the following format : `<name> shines at the <magnitude> magnitude`
 
 ### Usage
 
diff --git a/subjects/java/piscine/StarPlanet/README.md b/subjects/java/piscine/StarPlanet/README.md
index b0b69a8f2..16b731144 100644
--- a/subjects/java/piscine/StarPlanet/README.md
+++ b/subjects/java/piscine/StarPlanet/README.md
@@ -9,8 +9,8 @@ It has one private property : `centerStar` of type `Star`.
 
 There are two constructors :
 
-- one with no parameters, which calls the superclass constructor with no parameters. In this case, the `centerStar` property is initialized with the default Star constructor.
-- one with many parameters :
+- One with no parameters, which calls the superclass constructor with no parameters. In this case, the `centerStar` property is initialised with the default Star constructor.
+- The other with many parameters :
   - `name`
   - `x`
   - `y`
@@ -20,10 +20,10 @@ There are two constructors :
 
 We add a getter and a setter for the centerStar property (`getCenterStar` and `setCenterStar`).
 
-We will override the `hashCode` and `equals`, using the `centerStar` property.
+We override the `hashCode` and `equals`, using the `centerStar` property.
 
-Finally, we rewrite the `toString` method. The returned String must have the following format : `<name> circles around <centerStar.name> at the <distanceWithCenterStar> AU`.
-The `distanceWithCenterStar` is computed using the `distanceBetween` method with the planet and its center star.##
+Finally, we override `toString` method. The returned String must have the following format : `<name> circles around <centerStar.name> at the <distanceWithCenterStar> AU`.
+The `distanceWithCenterStar` is computed with the help of `distanceBetween` method taking as parameter the planet and its center star.##
 
 # Usage
 
diff --git a/subjects/java/piscine/StarProperties/README.md b/subjects/java/piscine/StarProperties/README.md
index 054cd9212..294a1f467 100644
--- a/subjects/java/piscine/StarProperties/README.md
+++ b/subjects/java/piscine/StarProperties/README.md
@@ -7,7 +7,7 @@ In the following quest, we will work with the same files and classes. You should
 Create a file `CelestialObject.java`.
 
 Create a public class named `CelestialObject`.  
-The class must contains four properties : 
+The class must contain four properties : 
 * x (double)
 * y (double)
 * z (double)
diff --git a/subjects/java/piscine/StarStatic/README.md b/subjects/java/piscine/StarStatic/README.md
index e9d7a1a32..0ce32f09f 100644
--- a/subjects/java/piscine/StarStatic/README.md
+++ b/subjects/java/piscine/StarStatic/README.md
@@ -4,9 +4,9 @@
 
 Let's add some computation.
 
-Our objective is to compute the distance between celestial objects. As you may have guessed, the x, y and z values are the coordinates of the object. Their unit is AU (Astronomical Unit) which is 150 000 000 km.
+Our objective is to compute the distance between celestial objects. As you may have guessed, the values x, y and z are the coordinates of the object. Their unit is AU (Astronomical Unit) which is 150 000 000 km.
 
-We will add two `static` and `public` method :
+We will add two `static` and `public` methods :
 
 - `getDistanceBetween` which takes two CelestialObject as parameters and returns a double corresponding to the distance between the two objects.
 - `getDistanceBetweenInKm` which takes two CelestialObject as parameters and returns a double corresponding to the distance in km between the two objects.
diff --git a/subjects/java/piscine/StarUtils/README.md b/subjects/java/piscine/StarUtils/README.md
index f341e369a..523895a9e 100644
--- a/subjects/java/piscine/StarUtils/README.md
+++ b/subjects/java/piscine/StarUtils/README.md
@@ -2,13 +2,13 @@
 
 ### Instructions
 
-Now, some utils method for our class.
+Now, let's add some useful methods to our class.
 
-First, the `toString` method which will return a literal version of our class. The format is the following : `<name> is positioned at (<x>, <y>, <z>)`. The printed double will be with 3 decimals.
+First, `toString` method which returns a literal version of our class. The format is the following : `<name> is positioned at (<x>, <y>, <z>)`. The printed double will have a precision of 3 decimals.
 
-Then, the `equals(Object object)` method which will return trus if all properties of the object as parameters are equals to the current object.
+Then, `equals(Object object)` method which will return true if all properties of the object in parameter are equal to the current object.
 
-As we have rewritten the `equals` method, we need to rewrite the `hashCode` method. This method returns an integer. If two objects are equals (using the `equals` method), then the results of their hashCode method should be equals.
+As we have overriden `equals` method, we need to override `hashCode` method. This method returns an integer. If two objects are equal (using the `equals` method), then the results of their hashCode method should be equal.
 
 ### Usage
 
diff --git a/subjects/java/piscine/StreamCollect/README.md b/subjects/java/piscine/StreamCollect/README.md
index f4c1b7d5a..423cb7d84 100644
--- a/subjects/java/piscine/StreamCollect/README.md
+++ b/subjects/java/piscine/StreamCollect/README.md
@@ -4,9 +4,9 @@
 
 Create a file `StreamCollect.java`.
 
-Create a function `mapByFirstLetter` which maps the first letter (to upper case) to the String.  
-Create a function `getMaxByModulo4` which return a map associating the modulo 4 to the max of the integer mathching the modulo 4.  
-##Create a function `orderAndConcatWithSharp` which joins the alphabetically sorted Strings with a ' # ' between each. The result String starts with a '{' and ends with a '}'.
+Create a function `mapByFirstLetter` which maps the first letter (to upper case) to a list of Strings begining with the given letter.  
+Create a function `getMaxByModulo4` which groups the integers by modulo 4 and returns a map associating each module 4 value to the max integer in each group.
+Create a function `orderAndConcatWithSharp` which joins the alphabetically sorted Strings with a ' # ' between each. The resulting String starts with a '{' and ends with a '}'.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/StreamMap/README.md b/subjects/java/piscine/StreamMap/README.md
index e3abcaf11..2eab6d2de 100644
--- a/subjects/java/piscine/StreamMap/README.md
+++ b/subjects/java/piscine/StreamMap/README.md
@@ -5,8 +5,8 @@
 Create a file `StreamMap.java`.
 
 Create a function `sumOfStringLength` which returns the sum of the length of the strings in the stream.  
-Create e function `upperCaseAllString` which returns the list of all the strings in upper case as stream.  
-Create e function `uniqIntValuesGreaterThan42` which keep only double greater than 42, transforms the double in integer and return them as a set.
+Create a function `upperCaseAllString` which returns the list of all the strings in upper case.  
+Create a function `uniqIntValuesGreaterThan42` which keeps only doubles greater than 42, transforms the doubles to integers and returns them as a set.
 
 
 ### Expected Functions
diff --git a/subjects/java/piscine/StreamReduce/README.md b/subjects/java/piscine/StreamReduce/README.md
index bb1dc298c..26390e948 100644
--- a/subjects/java/piscine/StreamReduce/README.md
+++ b/subjects/java/piscine/StreamReduce/README.md
@@ -4,8 +4,8 @@
 
 Create a file `StreamReduce.java`.
 
-Create a function `sumAll` which returns sum of integers in the stream.  
-Create e function `divideAndAddElements` which sum the result of the division between all the integers in the stream and the divider.  
+Create a function `sumAll` which returns the sum of integers in the stream.  
+Create a function `divideAndAddElements` which sums the result of the division, of all the integers in the stream, by the divider.  
 
 
 ### Expected Functions
diff --git a/subjects/java/piscine/StringConcat/README.md b/subjects/java/piscine/StringConcat/README.md
index 7d121b61a..bd2f76039 100644
--- a/subjects/java/piscine/StringConcat/README.md
+++ b/subjects/java/piscine/StringConcat/README.md
@@ -4,7 +4,7 @@
 
 Create a file `StringConcat.java`.
 
-Write a function `concat` that returns the concatenation of the two strings passed as parameters.
+Write a function `concat` that returns the concatenation of the two strings passed in parameters.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/StringContains/README.md b/subjects/java/piscine/StringContains/README.md
index 00bd15359..8ea45df91 100644
--- a/subjects/java/piscine/StringContains/README.md
+++ b/subjects/java/piscine/StringContains/README.md
@@ -4,7 +4,7 @@
 
 Create a file `StringContains.java`.
 
-Write a function `isStringContainedIn` that returns true if the first String as parameter is contained in the second String as parameter.
+Write a function `isStringContainedIn` that returns true if the string `subString` is contained `s` string.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/Wedding/README.md b/subjects/java/piscine/Wedding/README.md
index 0e7271525..142350c0d 100644
--- a/subjects/java/piscine/Wedding/README.md
+++ b/subjects/java/piscine/Wedding/README.md
@@ -4,8 +4,8 @@
 
 Create a file `Wedding.java`.
 
-Write a function `createCouple` that returns a map of name which associates randomly a name from the first list to a name of the second list.  
-If the lists have different size, some names from the bigger list will not be ignored.
+Write a function `createCouple` that returns a map of names which associates randomly a name from the first list to a name of the second list.  
+If the lists have different sizes, some names from the bigger list will be ignored.
 
 ### Expected Functions
 
diff --git a/subjects/java/piscine/WeddingComplex/README.md b/subjects/java/piscine/WeddingComplex/README.md
index 526ea1011..c1a9b71ec 100644
--- a/subjects/java/piscine/WeddingComplex/README.md
+++ b/subjects/java/piscine/WeddingComplex/README.md
@@ -5,23 +5,23 @@
 Create a file `WeddingComplex.java`.
 
 Write a function `createBestCouple` that returns a map of name from the first map associated with a name from the second list.  
-Each argument will be composed as follow : 
-* The name of the member to marry
-* The ordered list of preference of member of the second list.  
+Each map argument will be composed as follows :
+* Key: The name of the member to marry
+* Value: The ordered list of preference containing members (keys) from the other map.
 
 To objective of this function is to determine the best couple possible.  
-The best solution is when for a given member (will be called Alice) : If there is a preferred partner (will be called Bob) than the chosen partner (will be called Charly), Bob is happier with its chosen partner (called Daphnee) than with Alice.
+The optimal solution occurs when, considering a particular member named `Alice`, if there exists a preferred partner `Bob` over the selected partner `Charly`, then `Bob` is happier with his chosen partner `Daphnee` compared to being with `Alice`.
 
 > With an example : 
-> * First list : 
+> * First map : 
 >  * Naruto orders his preferences : Sakura > Hinata
 >  * Sasuke orders his preferences : Sakura > Hinata
-> * Second list : 
+> * Second map : 
 >  * Sakura orders her preferences : Sasuke > Naruto
 >  * Hinata orders her preferences : Naruto > Sasuke
 >
 > A correct solution for this example is : 
-> * Sasuke <-> Sakura (they are both with their first choice)
+> * Sasuke <-> Sakura (they are both with their first preference)
 > * Naruto <-> Hinata (Naruto would prefere Sakura, but Sakura is happier with Sasuke, Hinata has her first choice)
 
 All the test will be chosen to guarantee such a solution exists. More than one solution could exist.