I see in a previous post you said your using Ubuntu. Being new to Linux with allot of information and not knowing where to start can be overwhelming. Here's some suggestions, not in any particular order, just in case you haven't seen them:
This book was one of the first Linux books I purchased:
Running Linux, Fifth Edition
Here's one for Ubuntu beginners:
Ubuntu for Non-Geeks, Second Edition
There's probably lots more books to choice from.
If you have a particular question, then just post that in a new thread.