Where can i learn html?

I don't know where to put this question, and i hope this is ok, and you can help me with this question.

I would really like to learn some html. I don't have that much money since i'm only 15, so I can't buy really expensive books! It should be not too hard, and not too much at the time. The sites that i could find on the internet all have little pieces of html, mostly forums with questions. Isn't there something better?