Win+Home: Clear all but the active window
Win+Space: All windows become transparent so you can see through to the desktop
Win+Up arrow: Maximize the active window
Win+Down arrow: Minimize the active window or restore the window if it’s maximized
Win+Left/Right arrows: Dock the active window to each side of the monitor
Win+Shift+Left/Right arrows: If you’ve got dual monitors, this will move the active window to the adjacent monitor
Win+T: Shift focus to and scroll through items on the taskbar
Win+P: Adjust presentation settings for your display
Win+(+/-): Zoom in/out
Shift+Click a taskbar item: Open a new instance of that particular application