In my experience, learning from a Linux book did me no good. I had to just start using the hell out of it to really learn what's going on. Once I ran into something I didn't know how to do, I looked it up online or asked a question here on LQ if I couldn't find the answer myself.
This was a good starting point for me: DOS-Win-to-Linux-HOWTO.html
. A general Linux reference book might be a good investment as well. This is just for what it says though, reference. To learn how to actually "use" Linux, the best way to learn is to try.