That's a command line book, which is fine if that's what you want to know. But you could start with RUTE
, it's a little bit dated, but still relavent. You can also poke around for things at the Linux Documentation Project
. "An Introduction to Linux - A Hands On Guide" is a good place to start there.
I would start with some of the online stuff before I bought a book. And then I would probably check something out from the library because Linux changes fast enough that the books become dated pretty quickly.
What distro are you using (it looks like Ubuntu
from your profile)? Going to that distro's documentation site will explain a bit more about the workings of that particular distro.