Want to learn Linux administration quickly, easily, and in a practical, hands-on way? If yes, then the book Linux Administration: A Beginner's Guide is for you. Go buy yourself a copy from Amazon.
I've seen no other book that is more easy to follow, complete, practical, and fun to read than this one. If you hear someone saying administering Linux is difficult, just ask them to have a copy of this text. And I bet they'll be recommending it to *every* head interested in learning to administer Linux.
Have fun reading the book!