Capturing a screenshot on your smartphone isn't a new invention, not by a long shot. We've been able to do this for years, and it seems like every phone comes with a different combination of keys
that get the job done. Most of the times it's the power button that needs to be hit in combination with the volume up button, or the volume down button - depending on the phone type.
But that leads to all sorts of complications. If you just want to share a screen with somebody, this means holding down both buttons, exiting the app you're in, going to your media gallery app, going to the Screenshots folder and sharing the image from there - and while that's not that big of a deal, there is a simpler way to take a screenshot that doesn't leave dozens of screenshots saved on your phone. Here's how you can do this:
First, make sure you have Google Now On Tap enabled. To do this, go to Google Now, click on Settings, then go to the Settings menu item called "Now on Tap", which is just a slider that turns this option on or off - make sure it's on.
Then, go to the screen you want to capture in the screenshot and press and hold the home button (the one in the middle, at the bottom of the screen). This will open up the Google Now On Tap menu. Next, click on the Share icon that's on the bottom left; this will open up sharing options for the screenshot that has just been created, and you can instantly share the image wherever you want, and it won't be saved on your phone to clutter your photos.
And that's just about it! It took me a couple of months after getting the Now On Tap update to figure this out, but after I did it's the
way I take screenshots.