Well written paper on securing linux for newbies. Lots of good and updated info. Version 1.1.
You can download it from the following link: https://packetstormsecurity.com/files/download/11653/Secure.Linux.for.Newbies.v1.1.txt
Source: https://packetstormsecurity.com/files/11653/Secure.Linux.for.Newbies.v1.1.txt.html