Here are links to four sites that are very useful resources for HTML and graphic design, as well as a brief description of each. Just click on the screenshot to visit the site.
W3Schools has a lot of information about both HTML and CSS. I used it extensively while making this very site.
Html goodies is a site that I have not used too much in the past, but I found it while working on this site. It has help related to basic html all the way to advanced things like java.
Graphic Design & Publishing Center
Graphic Design & Publishing Center is an all inclusive site for graphic design. It has topics like: Photoshop, Design, Typography, Photography, and Web Design.
Graphic Design Blog
Graphic design blog is a great resource for graphic design. It is set up in a blog format, but there is a search function to find what you need. It has a lot of interesting logos and other design elements.