Windows 10 finally has a complete set of screen-capture tools. After installing version 1809, you’ll find a set of features that allow you to copy a rectangle, a freeform area, or the entire screen to the Clipboard, which now lets you save and reuse multiple items and even sync those clips to other devices; from the Clipboard, you can crop and annotate the screen capture (called a “snip”) in the new Snip & Sketch app, and then save and share the results.
(These new features are in addition to the traditional techniques based on the PrtScn key, which I explained earlier in How to capture and print a Windows 10 screen.)
