In the latest Android 6.0 upgrade, Google has added a new feature for the Marshmallow users. Post the update, Android users will be able to take screenshots just at a tap, instead of struggling with the power button and the volume rocker.
This new feature is available via the Google Now on Tap feature, which can be turned on by long pressing the Home button of the device, and simply following the instructions to turn on Now on Top. To the feature, Google has added a new share button, which lets you take screenshots, and also share it if you so wish.
The screenshots will not include any notifications in the status bar on top of the screen. Currently, this new feature is only available on Android 6.0 Marshmallow, but it soon may be rolled out for other non-Nexus devices too.