I thought the first one about the color property seemed pretty obvious and fundamental. That's the whole "cascading" thing! But, if you learn CSS in bits and pi

I thought the first one about the color property seemed pretty obvious and fundamental. That's the whole "cascading" thing! But, if you learn CSS in bits and pieces, it's certainly something that's easy to miss. Positioning is another fundamental topic that is hard to learn without really taking a close look. It's not glamorous or new, but I think a lot of people (myself included, until recently) don't fully understand how positioning works. A List Apart has a good article on the subject: http://alistapart.com/article/css-positioning-101 http://alistapart.com/article/css-positioning-101 In the same vein, another good topic is selectors. They're quite powerful, but if you only ever look at simple styling examples, you'll never really be exposed to their breadth and power. Check out the docs: http://www.w3.org/TR/CSS21/selector.html http://www.w3.org/TR/CSS21/selector.html