Man Pages are the easiest way to RTFM....

If you have ever been looking for more details than --help or -h provide.  Check for a man page.  Don't know what command to use to make a copy of a file?  Try man -k copy and see what commands come up to help you.  man is the original online help system.  It is one of the most powerful tools to master for new Linux users.  This article gives a brief but helpful intro to man.

Comments

[Kaleb Brasee]

Yep, I've never used any built-in Linux command that wasn't perfectly explained by the man pages. Still, some programs (notably Subversion) aren't covered that well by the man pages. In the case of svn, its man page recommends going to the official site to find documentation. It is possible to get more detailed help on the command line by using svn help "subcommand name", but it still doesn't help as much as the site.