surfing on the net I found this book Securing-Optimizing Linux the ultimate solution and started to read because has a pdf version for free and has step by step of securing your box and configuring, and I find it very helpfull. I can said is a must read book for newbies in linux or anyone interested.
Ok i'll continue reading the book! it's addictive!! c ya!
:)
url : http://www.openna.com/products/books/sol/solus.php
