Useful Shortcuts in Mac OS X

1. In Safari, go to top of the page or go to bottom of the page
1. Shortcut: Command + "Up arrow" or Command + "Down arrow
2. In Safari, shortcut to tabs
1. Shortcut: Command + "number"
3. Fine tuen the volume -- by pressing F11 or F12, the system will increase or decrease the volume level by one unit, if you want to have a fine adjustment, the following shortcut will take one quarter unit of volume adjustment.
1. Shortcut: Option + Shift + F11 or F12
4. Show the desktop 
1. Command + F3
5. Delete a word 
1. shortcut: Option + Delete