to add to the suggestions: if you add the CTRL key on macOS, your screenshot will be saved to your clipboard - from which you can paste it directly into another application.
Example SHIFT-CTRL-CMD-4
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Yeah, what’s up with that name. Is it an unfortunate spelling of something resembling ”cuckoos”, the sound of roosters in plural form. Or something else? 
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Mac also has a handy program which I keep in the dock called something like Screenshot of perhaps Screencapture (I’m guessing what the name might be in the English language operating system). It allows the capture of the entire screen, as well as areas and windows, but can also make movies of the same areas, although these are saved in .mov format and would need to be converted.