Game Hack Coding.

Hello, I am new to this forum and i have started some projects on the internet, so i have some question about it a i need to learn everything about it.

1. What do i need to make a game hack.
2. How can i make a game hack.
3. What are the best popular games ( I know about some but don't play exept CS 1.6 )...

Hope you help me guys, and thanks an advance.

Best regards.