If you just took a screenshot on your Mac/Macbook and you want to crop it, you need to look for the Marker icon when you open the screenshot image with the Preview App.

As you may see in the above image, I have highlighted the Marker icon, when clicked you get to see a whole lot of options which you should see the Selection tool icon as well.

Use the Rectangular Selection option to select the area that you want to crop.
Next you go to Preview App Menu: Tools -> Crop

And you should have the cropped image of your screenshot.

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Facing issues? Have Questions? Post them here! I am happy to answer!
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