The magical, mystical tilde!

The tilde (~) is a shortcut that can be used to specify paths of users.
SymbolMeaningExample
~Your home path.cd ~
#takes you to your home directory
~wphillipThe home directory of user with username 'wphillip'.~wphillip/usetcsh
Executes the program "usetcsh", which is located under the account of user 'wphillip'
Keep it in mind when you are required to specify path. It can save you a LOT of time.