You can take a screenshot on a Chromebook just as easily as you can on any other computer. Whether you need to save a piece of information for reference or just need to help someone out by showing something visually, it's extremely simple. Hold the control key and hit the task switching key ]] to capture the screen.
You'll get a desktop notification to click and view the screenshot, or you can always find later it by opening the Files app.
Note: The above comes directly from their article. Click here to read more.