Windows: Press PrtScn to copy the entire screen to clipboard
Windows: Press Win + PrtScn to save a screenshot to Pictures > Screenshots
Windows: Press Alt + PrtScn to capture the active window to clipboard
Windows: Press Win + Shift + S to open Snipping Tool and select an area
Windows: Open Snipping Tool from the Start menu, then choose New and select an area
Mac: Press Command + Shift + 3 to capture the entire screen
Mac: Press Command + Shift + 4 to capture a selected area
Mac: Press Command + Shift + 4, then press Space to capture a window
Mac: Press Command + Shift + 5 to open screenshot options
Chromebook: Press Ctrl + Show Windows (or Ctrl + F5), then select the area
Chromebook: Press Ctrl + Show Windows (or Ctrl + F5) twice for full screen
Linux (GNOME): Press Print Screen to capture the screen, or Shift + Print Screen for a selected area
Linux (KDE): Press Meta + Print Screen for a full screenshot, or Shift + Print Screen for a selection