Amit – it’s all explained in the course notes. You continue to ask me questions that would require me to type out a full lecture and, I’m sorry, but there’s no way that’s going to happen.
The point of this website is to help students to resolve particular issues. You appear to think that the lectures and notes are there on the site for those people that may happen to want to watch / read them whereas, for people like yourself, you can bypass all that nonsense and simply ask me to start from point zero and provide you with a personal explanation of a major concept
Do the work and then come back to me with PARTICULAR matters that you don’t understand. Then I’ll help you