how do you make your hair grow faster and thicker?

ive heard biotin makes hair grow fast, it that true?
my hair is fine, thin, blonde, and frizzes up in humidity. sounds bad, huh? lol.
well, my hair is about 2 inches below my shoulders, and i want it to be above my belly button but below my chest area. how long would that take to grow?
is there any way i can thicken my hair?
how often do i trim it? (ive heard 7-9 weeks?)
are there any products i can use to make it healthier?

How to make hair grow faster