HOWTOs - How to do all kinds of stuff
The latest HOWTOs are online at
http://metalab.unc.edu/LDP/HOWTO/HOWTO-INDEX-3.html#ss3.1,
however your system should have them as well: /usr/doc/Linux-HOWTOs/ -- information about everything /usr/doc/Linux-mini-HOWTOs/ -- more information
/usr/doc - documentation online
Documentation for just about every package on your system is here.
Manual Pages -- the online manual
Enter man followed by a command. You can get a list of commands by pressing TAB
twice at the shell and answering 'y'. To learn how to use man enter $ man man.
info -- information
The emacs editor has plenty of information about a variety of subjects.
Either enter the command $ info or enter the command $ emacs and
once in the editor hit Control-H then i.