What's the best stuff or (treatment) for damaged hair that I can get at a store?

My hair is straight and whenever I curl it or put curling stuff in it, it doesnt stay curly how do I get it to stay?

i have blonde hair with brown highlights in it but i want blonde how do i do that???

Is it true if you bleach your hair it gets damage?

I have noticed a little hair on my top lip! Whats the best way to get rid of this? Or the best way to keep it away for longer?

I need to get a knot outa my hair I've tried conditioner and all that

I have dark brown hair and green eyes,what is the best highlight color or my hair

what is the best way (and works for ages) to get rid of underarm hair?

Whats the best design on your hair.(ex. Stars, triple lines)

are their any homemade recipies that I could use to get my hair storong, and healthy from heat damage? and keep frizz away?

Is there any way to get rid of lil hair marks..like where the hair grows?