Update read me

Author: rampal-punia

README.md

@@ -73,6 +73,18 @@ To accumulate the data of similar properties and methods together.
 
 By creating a new object we add this new instance, or any future instance, to a particular bundle. That bundle is called a `class`. If we have the same set of objects with similar attributes and functionalities we should create a class. Also, class supports inheritance. With classes we can reuse our codes or the codes written by other programmers. (Packages, modules and frameworks)
 
+With proper implementation of classes, in theories, we achieve:
+
+- Separation of concerns
+
+- Decoupling
+
+- Encapsulation
+
+- Implementation hiding
+
+- Inheritance
+
 ---
 
 ## Naming a class
@@ -375,4 +387,8 @@ Reduce the complexity of the code.
 
 ---
 
+To avoid the temptation of writing classes for every problem at hand, and everywhere we like do watch this vice. [Stop writing classes](https://www.youtube.com/watch?v=o9pEzgHorH0)
+
+---
+
 This tutorial is still under development. If you find any spelling, grammatical or syntax error, convey it through raising issues. There may be other concept related mistakes, if you found any please raise issue, or discuss.

examples/4_1_car_class.py

@@ -1,8 +1,22 @@
+'''📝 Python Class Tutorial: Best practice to choose variables in __init__ method.
+
+✨ Example of a car class. Things to be required 
+'''
+
+
 class Car:
+    """A car class to associate all the models of a car company."""
     MAKE = "TATA Motors"
     year = 2022
 
     def __init__(self, model, color, speed):
+        """Constructor of Car class with model, color and speed.
+
+        Args:
+            model (_type_): _description_
+            color (_type_): _description_
+            speed (_type_): _description_
+        """
         self.model = model
         self.color = color
         self.speed = speed