You can use the "print screen" button on your keyboard, but IIRC only saves to clipboard, so you'll need to paste to a graphics program and then save it. I think it saves as a .bmp, which means the files will be quite big- but your graphics program will be available to save it as a .jpg or whatever else you like.
The easiest way to take a screen shot on mac is to press command+shift+3. To select a specific area to take a screen shot of, press command+shift+4. The screen shots are saved to your desktop.
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