Taking a screenshot on a Mac is easy as long as you know how to take it. You can use any of the programs that come preinstalled on your Mac to do so, including Preview. If you don’t have a keyboard, you can use a mouse to click and drag your cursor over the screen. Press Space to take a screenshot horizontally. If you hold down Shift, your screenshot will be copied to the pasteboard instead. This link
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To take a screenshot of the entire screen, you need to hold down Ctrl+Shift+3 keys. Your pointer will change to a camera icon, and you can move the pointer across the screen to highlight a specific part. Pressing esc will change your screenshot selection, and if you don’t like it, you can always cancel it. This screenshot feature is especially handy if you’re using the keyboard a lot.
To capture a part of the screen, hold down the spacebar while holding down Command+Option+Space. Once the image is selected, click the spacebar to release it. Once the image is captured, you can paste it into any app you’d like. You can also use the shortcut Ctrl+Shift+Command+3 to capture the entire screen. If you only want to capture a specific area of the screen, use Shift+Command+4 instead. This will allow you to select just a portion of the window.