not that I am a guru, not even close. Anyway, the only way to become a guru is to learn from brightest and the best linux administrators, buy and read books, ask questions, search the internet for info (google is your best friend), keep up to date will security patches and software updates, and most importantly, be part of this community here @RS. This board is just a wealth of information thanks to all people that contribute their time and knowledge.

In this context, I invite all of you to post in this thread all you sources of informations online. Doing this, we all benefit and learn new stuff.

Thanks.

For beginners:
http://www.ctssn.com/linux/lesson1.html

http://www.linuxnovice.org

http://linuxcommand.org/

Advanced Bash Scripting:
http://en.tldp.org/LDP/abs/html/

Linux in Spanish:
http://www.escomposlinux.org/

Several OS Linux books:

http://oreilly.com/openbook/

The whole series of O'Reilly UNIX/Linux books!

http://unix.oreilly.com

Linux documentation project:

http://tldp.org

comp.os.linux.admin: