Take a screenshot of the screen, and save it as a file on the desktop
Command-Shift-3
Take a screenshot of an area and save it as a file on the desktop
Command-Shift-4
Take a screenshot of a window and save it as a file on the desktop
Command-Shift-4, Space
Take a screenshot of the screen, and save it as a file on the clipboard
Command-Control-Shift-3
Take a screenshot of an area and save it as a file on the clipboard
Command-Control-Shift-4
Take a screenshot of a window and save it as a file on the clipboard
Command-Control-Shift-4, Space