For all expert programmers. How did you able to memorized all of the codes that you've learned? :)

Answer 1

You don't try to memorise, you try to understand. If you understand but you can't remember then you can simply search what you've forgotten. But if you don't understand then it doesn't help if you remember. So try to understand.

Answer 2

Actually a good program never learn the codes. if you knew the language then you will able to create any program by your own logic.