How do I remember these concepts?

Answer 1

By constant practice.

Answer 2

bingo

Answer 3

1. Practice every thing you learn
2. do some crazy experiments every function/command you learn
3.do some simple program like a random number generator for lottery draw, calculator etc...
practice makes a program perfect.

Answer 4

Practice regularly, its the best way.
It even becomes fun and the concepts stick seamlessly when you repeatedly apply them.

Answer 5

Thx guys