The best way to learn about what the Mac can do is to ask those who use them. User Groups are a Mac phenomenon. It would take way too much time to write up the reasons you should join a user group. Chances are there's a group near you. Before you upgrade your software or OS, or if you're having any other odd problems, check out MacFixIt .
Users share all sorts of trouble shooting information there.
MacInTouch site is another must-visit place to visit regularly. It really does help keep you in touch. Ric Ford has been keeping people in touch with Mac issues since 1994. I laugh when Windows users tell me they prefer Windows because you can get into the system and really tweak or control way the computer works. First, the whole point of the Mac is that you don't have to do that.