Adding module positions to Joomla templates is hard to understand, so here's a great article explaining how to do it:

With all the free information online is it really worth buying a book on CSS3? You might think not but it was a book that I really enjoyed personally and feel I took a lot from. I see I'm not the first person to review it, one of the guys over at visualswirl have reviewed it and I have to say I think they're spot on. Here's their link:

Is it worth reading? I'd say yes, if you enjoy what you do your going to enjoy this book. It's a fairly light read but well worth the money if you are making the decision to increase your CSS3 knowledge.