How do u all remember these programs???

Answer 1

You don't need remember it in memory at once. There is allways the help and internet sources to remind you the right syntax.
But can be a good idea to choose a friendly development tool .Some of them have a very good support for quick help of syntax, templates and so on..

Answer 2

The time you study and practice using the code depend how bright you are

Answer 3

Exercise, it's really helps.