Windows + PrtScn (saves to PicturesScreenshots)
PrtScn (copies the whole screen to clipboard)
Alt + PrtScn (copies the active window to clipboard)
Windows + Shift + S (opens Snipping Tool; select area to copy to clipboard)
Use Snipping Tool: Start menu → Snipping Tool → New → select area
Use Snip & Sketch: Windows + Shift + S (then select notification to open and save)
Use Game Bar (if available): Windows + G → Capture → Screenshot