You can easily take a picture of the screen on your Mac by holding down these three keys on the keyboard:
Shift + Command (cmd) + 3
This will automatically save a picture to the desktop which you can then open and edit later. If you want to capture a smaller section of the screen, try:
Shift + Command (cmd) + 4
This gives you a screen capture cursor on the screen which you can click and drag to cover a specific area.
For more details, see the guide on the Apple web site.
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