Permissions how-to?

I want to learn how to change file permissions to give access to different
users. chmod's man page isn't that helpful in my opinion, and I can't find a
how-to on this topic. Can anybody point me to where I can find documentation
on the web concerning file permissions, ownerships, etc.


--
Rick Rosinski
http://www.rickrosinski.com
rick@rickrosinski.com