Just pressing the windows key alone will show the ‘start’ menu. But you can also use this key for many other shortcuts when combining this key with another letter. Here are the list of windows key shortcuts.
Win key + R : To open ‘Run’ box in Start Menu
Win key + F : To ‘Find’ window in Start menu
Win key + E : To open Windows Explorer
Win key + Pause/Break : To open System Properties
Win key + M : All open windows will be minimised
Win key + Shift + M : All minimised windows will open
Win key + D : Will show all minimised windows
Win key + Tab: Will rotate and select programs in the task bar