Common Keyboard Shortcuts for the Mac

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Command-Q
Quit any program

Command-W
Close whatever active window you are using,

Option-Command-W
Close all the windows in the currently active app

Command-T
Open new tab

Command-Tab
Switch Apps

Command-X, Command-C, Command-V
Cut, Copy, and Paste

Command-F
Search

Command-Shift-3, Command-Shift-4
Snapshots

Command-Shift-A, Command-Shift-U, Command-Shift-D, Command-Shift-H
Navigation in Finder

Command-Option-Esc
Force Quit

Command-H, Command-Option-H
Quickly Hide Windows