Here are three built-in Windows screenshot keyboard shortcuts, most of which will also work in earlier versions of Windows. We'll also suggest a few third-party applications for those who need a more powerful screenshot utility.
The old screenshot standard still exists in Windows 10. Press the PrtScn button and your entire screen (or screens, in a multi-monitor set-up) is copied to the clipboard. From there you can paste it into Paint, GIMP, IrfanView, Photoshop, or any other photo program that allows you to paste in an image.
Add the Windows key
An upgraded version of PrtScn available since Windows 8 is Windows key + PrtScn. Tap those two keys simultaneously and your screen (or screens) will "blink" for a second, as if a camera shutter was opening and closing. Open File Explorer, navigate to Pictures > Screenshots, and your screenshot will be there waiting for you.