You're probably better off getting a beginner's photography book. I'd suggest "Kodak's Guide to 35mm Photography." It's an old book, you can probably guess since it teaches you how to use a film camera. What it teaches applies to DSLR just as easily. It's one of the best beginner's book out there.
The reason I suggest a book instead of a web site is because the book you can carry it along when you're out shooting. Like CrackedButter said: Go out and practice, practice, practice.