Ubuntu Philosophy: http://www.ubuntu.com/ubuntu/philosophy

File Permissions: https://help.ubuntu.com/community/FilePermissions

Command Line Introduction: https://help.ubuntu.com/community/BasicCommands

nano Text Editor: https://help.ubuntu.com/community/NanoHowto

sudo and Absence of Root in ubuntu: https://help.ubuntu.com/community/RootSudo

Getting Started With Linux: http://www.linux.org/lessons/beginner/index.html

Run as root: http://anotherubuntublog.wordpress.com/2006/11/14/got-root/