I've always pointed people to w3schools. I'd start by learning HTML4, and then you can learn the new features in HTML5 once you are comfortable with the core.

I've always pointed people to w3schools. I'd start by learning HTML4, and then you can learn the new features in HTML5 once you are comfortable with the core. I'd also suggest that you build a buttload of webpages. Reading the tutorials isn't going to help much, if you don't get hands-on.