Dear Sister Saad,
With due respects, the forum is much ahead of your elementary knowledge of a 12 year old. Why should we want to be spoon-fed without hard work? WE RETAIN WHAT WE LEARN WITH HARD WORK.
You asked these questions before and they were answered.
I strongly recommend that you study more to give yourself a sound basis.
Please do not mind the sincere advice. We honor you, dear Sister.
Repeat: WE RETAIN WHAT WE LEARN WITH HARD WORK.