Windows Key + M : Minimize all windows 

Windows Key + Shift + M : Restore Minimize windows

Windows Key + Ctrl + D : Add new  virtual desktop

F5 : Refresh your active window

Windows Key + L : Lock your computer

Ctrl + A : Select all items in a windows

Windows + A : Open the quick setting flyout

Windows + N : Bring up the Notification center

Win + W : Open the Widgets page 

Win + Z : open the snap layouts flyout