Screen shot on a MacBook Pro

How to take a screenshot on your Mac

1. To take a screenshot, press and hold these three keys together: Shift, Command, and 3. 
2. If you see a thumbnail in the corner of your screen, click it to edit the screenshot. Or wait for the screenshot to save to your desktop.

How to capture a portion of the screen

1. Press and hold these three keys together: Shift, Command, and 4.
2. Drag the crosshair  to select the area of the screen to capture. To move the selection, press and hold Space bar while dragging. To cancel taking the screenshot, press the Esc (Escape) key.

All the methods & where to find them in this link...

https://support.apple.com/en-us/HT201361#:~:text=In%20macOS%20Mojave%20or%20later%2C%20you%20can%20also%20set%20a,more%20about%20the%20Screenshot%20app.