If you are making use of the built in Mac Screenshot App to record your screen, and you and unsure on how to stop it, well there are a few ways in which you can do that.
Option 1: Using the Menubar icon
As you start recording, a stop icon will appear on the right hand side of the Apple Menubar. Just click on it and the screen recording will stop.

Option 2: Using Keyboard Shortcut
Having to move your mouse to the Menubar and then stopping the recording may get recorded and not look good, so the keyboard shortcut is a better way to stop it.
Keyboard Shortcut:
Control ^ + Command ⌘ + esc
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