http://www.echoecho.com/html.htm
This site has several links to different tutorials on html in a very user friendly table so that it is easy to find what you are looking for. The site even allows you to quiz yourself over each category. Two concepts I learned about using the site are html frames and html meta tags. Both can be very useful when creating and customizing a website.
For example:
Frames can be very useful in organizing a website into different windows. The frames can be loaded and changed individually at any time. This feature can be very useful if you want to create a navigation bar that shows up on every page.
Meta Tags are also very useful because they help people find and learn about your website based on specific keywords that you define. Google uses meta tags to find websites so it is in the websites best interest to have as many relevant meta tags as possible.
One very useful website that I found interesting and helpful was www.createblog.com/blogger-layouts/. The website included different templates and layouts you can use for your blog site.