Windows 10 has built-in print screen option that works great for basic tasks, but many third-party programs offer more ease of use and features.
Take Quick Screenshots with Print Screen (PrtScn)
The Print Screen button on your keyboard can take a screenshot and save it as a file, take a screenshot of only one window (instead of the whole screen) or take a screenshot and save it as an image file.
To Take a regular Screenshot
Press “PrtScn” button, a screenshot of your currently active window will be copied to the clipboard. You can now paste it into your favourite image editor or document editor.
To take a screenshot of only one window, click on the title bar of the window that you want to capture. Press “Alt + PrtScn”, and a screenshot of your currently active window will be copied to the clipboard.
To Save Your Screenshot as an Image File
Press the “Windows logo key + PrtScn.” The screen will dim for a moment, and then you will see the screenshot appear as a file in a folder entitled “Screenshots”, inside your default “Pictures” folder. The screenshot is automatically labelled with a number, e.g Screenshot (1).png.
See more at:
http://www.howtogeek.com/226280/how-to-take-screenshots-in-windows-10/