These are not a list of the only sites you should visit for advice, knowledge, or tips on photography. There are hundreds of them out there.
These first ones are just the top three I think give you the most knowledge back for your time spent on them.
Bonus is they are all free!
DIGITAL PHOTOGRAPHY SCHOOL
OK, I will say that this one of the best places to get started at. Besides the articles there is a great community forum where you can get feed back, show images and even participate in a weekly contest to give you ideas on things to shoot. I would suggest you start here: Digital Photography Tips for Beginners.
THE PHOTOGRAPHIC ACADEMY
I will attest, Steve’s Academy site gives a great quick read on many fundamentals. It’s not so much fine grain like a textbook that will bore you away from learning but it’s more than a quick gloss over you find on many forums or blogs.
If you find that you are wanting more here are a few links that will also be beneficial to check out:
Smashing Magazine’s 50 Free Resources That Will Improve Your Photography Skills
Thomas Hawk Digital Connection 10 Tips for the New Digital SLR Photographer
All Things Photography’s Beginning Digital Photography – From Point and Shoots Cameras to Digital SLRs
If you are a Canon User like me and if you are on a budget like me!
The Wirecutter’s The First Canon Lenses You Should Buy