It gets cumbersome taking screenshots on Android sometimes, especially with unusually placed power and volume buttons. A new update for Google app on Android Marshmallow eases this issue for you.
You can now take screenshots by just pressing on the Home button for an extended amount of time. Google Now on Tap even makes it easier to share screenshots. There will be a share button that will appear at the bottom to send those screenshots easily. It even takes out the notification bar if that bothers you.
Source: Lifehacker