Creating screenshots is quick and easy on a Chromebook if you know how to do it.
Creating screenshots involves the “Show Windows” key at the top of a standard Chromebook keyboard. If you’re using a non-standard Chromebook keyboard, possibly an external keyboard, this is the same as the F5 key.
To take a single full-screen screenshot, use the following keyboard key combination:
Ctrl + Show Windows
To capture a portion of the screen, use:
Ctrl + Shift + Show Windows
When this key combination is used, the mouse cursor turns into a crosshair and you can drag to capture the portion of the screen you choose.
When the Chromebook is in tablet mode, you can use the following hardware key combination to take a screenshot:
Power button + Volume down button
For even more granular and customizable screenshots, use: Nimbus Screenshot & Screen Video Recorder