To take a screenshot of the full screen resolution of the entire screen, hold down the Command and Shift keys simultaneously and do not release then press the number 3. To take a screenshot of a specific part of the screen, the same way, press the Command and Shift keys simultaneously and press 4.
The result is a PNG image file on your desktop, and file names based on the date and time of capture screenshots.
Bonus: The PNG format is pretty good for screenshots, since it provides a good balance between file size and sharpness of the image, but if you choose JPEG instead, you need to enter the following two commands into the terminal (one by one).
default write com.apple.screencapture type jpg
killall SystemUIServer
The first line change the screenshot file format, and the second line to restart the process that used to take pictures. The default is PNG, but you can choose GIF, JPG, TIFF, and even PDF. Read our other article How to Record Screen on Mac With Free.
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