To take a screenshot on your Mac, follow the steps below:
1. Hold the Command and Shift keys down on your keyboard and press 3.
2. Your Mac captures the entire screen and saves it as a file on the desktop.
The file name will look like this: Screen shot 2019-07-14 at 08.45.00 AM.png.
You can then just attach that file to a website or an e-mail message to whomever you would like to send that screenshot.