This is the best site I know of. It is comprehensive and easy to understand. I have used Annabella's page a lot while making my pages.
Get the picture? There are hundreds of useful HTML help sites out there, so go explore. Here are some places where you can get free web space.
Of course, I highly recommend Tripod. You get an astonishing 11 MB of space for free, which is a LOT. I haven't even used up 1 MB with all of these pages. Tripod also offers great resources and tools like Pods.