Programming with c# Beginners Level 
https://www.youtube.com/watch?v=qu5HRD1MWBM

How to use owl carousel Slider

https://www.youtube.com/watch?v=QCbwyx96wJ0

What is Encapsulation?
https://www.youtube.com/watch?v=KwYVz1xqgaQ 

https://www.youtube.com/watch?v=KwYVz1xqgaQhttps://www.youtube.com/watch?v=KwYVz1xqgaQhttps://www.youtube.com/watch?v=KwYVz1xqgaQ 

What is Polymorphism ?

https://www.youtube.com/watch?v=-gx14S77g9w

What is Inheritance ?

https://www.youtube.com/watch?v=uqeNfObdBas

What is class and object 

https://www.youtube.com/watch?v=SebNr5t4KR4