There are at least eight different ways you can take a screenshot with Windows 10. If you want to capture and save a picture of your entire screen, the easiest way is to hit the Windows key + Print Screen key, and that picture will be saved to the Pictures > Screenshots folder.
To capture just one part of your screen, hit the Windows key + Shift + S to open a tool called Snip & Sketch, which allows you to click and drag to create a screenshot, which is saved to your Clipboard.