A true sign of becoming an OS X Master, in my opinion, is the learning of keyboard shortcuts. It drives me crazy to see a user scroll "all the way" up to the File menu, scroll down to Copy...then do it all over again for Paste, Print, etc.
So, in the interests of helping you and yours become an OS X Ninja, here is Apple's list of OS X keyboard shortcuts. There are even a few in this list I didn't know about! http://support.apple.com/kb/HT1343