zexter...
Websites are nice, but if you really want to get indepth, and learn your system inside and out, you might want to frequent www.half.com
They have great stuff, you can pick up Linux books for just a few bucks...You'll also find that a lot of old UNIX tutorials from the oldschoolies will show you basic console commands as well.
I don't know, just my two cents, I've always found that getting the complete picture from a book is a little more consistent than piecing it together from websites...although sometimes you have to.