This article will show you how to take a screenshot on the Essential Phone.
Hold Volume Down and Power
Simultaneously hold down the Volume Down and Power buttons. After about a second, you'll see the screen flash, indicating a screenshot has been captured.
Use your screenshot
By pulling down the notification shade you'll have option to view, share, or delete the screenshot you just captured.
If you need to access your screenshot from a computer or other file browser, it'll be saved in the directory Pictures → Screenshots.