Taking screenshots is a bit cumbersome on Android. You’d have to press the power and volume down button at the same time. A new update from Google lets you just use your home button to take the screenshot for you. It’ll even take out the notifications bar and have a share button so you can easily send the screenshot to yourself or someone else. However, this only works with Google’s Now on Tap, which means you need to have Android Marshmallow running and you have the latest Google app.
Source: Lifehacker