Press PrtScn to copy the entire screen to the clipboard
Press Alt + PrtScn to copy the active window to the clipboard
Press Windows + PrtScn to save the entire screen as a file in Pictures > Screenshots
Press Windows + Shift + S to open Snipping Tool controls and capture a region (saves to clipboard)
Press Windows + Shift + S, then select the window/snipping mode to capture a specific area
Open Snipping Tool from Start, then choose New to capture a region and save it
Use Snipping Tool with Mode options (Free-form, Rectangular, Window, Full-screen) and click Save