For Mac OS X, there are plenty of shortcuts available. All the actions you do with mouse can be done with the keyboard too. Learning shortcuts will help you to work faster as well as improve your skills over using the computer. So here I’m gonna give some of the basic shortcuts for Mac OS X Mountain Lion.
Command + Space = Spotlight Search
Command + Delete = Move To Trash
Command + E = Eject Selected Drive (or) Volume
Command + Shift + 3 = Capture Entire Screen
Command + Shift + 4 = Capture Selected Area
Command + Option + D = Show/Hide Dock
Command + Option + Eject = Sleep
Command + Shift + Option + Eject = Shutdown
These are the few shortcuts for Mac OS X Mountain Lion. To know more shortcuts follow the link below, you will be prompted to download a PDF file in that you will find more shortcuts for Mac OS X.
http://macmost.com/downloads/MacMostKeyboardShortcutsMountainLion.pdf