>>42424924
>>42424815
Well I'll spoonfeed, since I support some people using Macs and therefore occasionally I use macOS as well.
The shortcut for taking a screenshot of whole screen is Cmd + Shift + 3, no additional software required. Not as intuitive as simply pressing Print Screen key on Windows or most Linux/BSD desktop environments, I know.
I hope you remember this OP, since making photos of computer screen with your phone makes you look dumb by default.