Ubuntu Hacks: Tips & Tools for Exploring, Using, and Tuning Linux

It is Oreilly which if your new means well written to the point . I like the dummy series which are good reads on what can be a mind numbing topic and I do this stuff for a living. This is good goto book nice easy or hard to do and it tells you that good explanation and examples. If you need more Debion has documentation on commands at it's website. The problem is going through all the information.