1. Find a good video about "Inheritance" on youtube and post a link to them for everyone to watch. The video doesn't necessarily have to use java (although that would be preferable), but make sure it

1. Find a good video about "Inheritance" on youtube and post a link to them for everyone to watch. The video doesn't necessarily have to use java (although that would be preferable), but make sure it explains OOP/inheritance well. In this post make sure to include an explanation about how and why inheritance is used.

2. https://www.youtube.com/watch?v=8yjkWGRlUmY

 - please summarize the main idea of this video 

- Ask one question about this video 

3. https://www.youtube.com/watch?v=CWYv7xlKydw

-  Ask one question about this video 

4. I don't quit understand how implementation works, is it just use to hide variables and methods, what the purpose of it? based on these videos https://www.youtube.com/watch?v=CWYv7xlKydw and https://www.youtube.com/watch?v=zbVAU7lK25Q or from you best knowledge