diff --git a/README.md b/README.md
index 2079c09..ebadcfd 100644
--- a/README.md
+++ b/README.md
@@ -14,13 +14,13 @@ Lessons:
 - [instanciating objects, accessing attributes and methods](./lessons/Instances.md)
 - [creating a class](./lessons/Classes.md)
 - [constructors](./lessons/Constructors.md)
+- [inheritance](./lessons/Inheritance.md)
+- [encapsulation](./lessons/Encapsulation.md)
+- [properties](./lessons/Properties.md)
+- [polymorphism](./lessons/Polymorphism.md)
 
 Work in progress:
 
-- inheritance
-- encapsulation
-- getter / setter / property
-- polymorphism
 - virtual classes
 - interfaces
 - Factories
diff --git a/lessons/Encapsulation.md b/lessons/Encapsulation.md
new file mode 100644
index 0000000..e69de29
diff --git a/lessons/Inheritance.md b/lessons/Inheritance.md
new file mode 100644
index 0000000..e69de29
diff --git a/lessons/Polymorphism.md b/lessons/Polymorphism.md
new file mode 100644
index 0000000..e69de29
diff --git a/lessons/Properties.md b/lessons/Properties.md
new file mode 100644
index 0000000..e69de29