If you are using a Windows machine:
How to take a screenshot of your active window
There’s a shortcut to the above process if you want to take a screenshot of your current active window. Just press “Alt” + “PrtScn”. Your active window will be captured, but it won’t automatically save -- to do this, find the screenshot in your clipboard, open an image editor, and save it from there.
How to take a screenshot of your entire screen on Windows
If you want to take a screenshot of your entire screen and save the screenshot automatically, hit the “Windows Key” + “PrtScn”.
Your screen should dim for a moment, and then the screenshot will be saved in Pictures > Screenshots folder.