I want to know everything under a car's hood! i want to learn about car's etc!?

if you just want to teach yourself, then do what the other guys said , but i would suggest finding out if any courses are offered either through a local community college or local tech school. this way you can really learn everything, because to learn everything about cars is no joke, new cars are complicated. this is not the stuff of just being a backyard grease monkey any more. it is really technical stuff. if you really want to get into cars then you need to really get schooled on it. i don't know how old you are but some high schools offer free enrollment in local tech schools, were you can go there half of the day.