How to take good care of my hair?

How to take good hair of ones hair?
How to take good care of ones hair?
How often should I use shampoo?
What kind of shampoo should I use?
Should I apply hair oil everyday?
Which hair oil is good for growing long hair? Almond oil or gooseberry (‘Amla’) oil or mustard oil or some other?
How often should I comb my hair?
I guess i have started losing some hair on sides of my forehead,what should I do? What could i possibly have done wrong? I am just 19 year old.