Winkey +X: Displays the quick access professional menu for advanced users as shown
Winkey +Q: displays the Cortana help
Winkey +W: displays the Windows workspace; and sticky notes
Winkey + I: displays the settings of windows corresponding to control panel
Winkey + L : Lock out the computer
Winkey + D: displays the desktop
Winkey +Right arrow or left: frames the app window to the right or left and displays a panel with other aps to match the 2 apps side by side
Winkey +up arrow: maximise and the down arrow minimise the app to the taskbar
Winkey + (first letter of the apps: launches the app
Winkey + 1: launches the first app pinned in the task bar...etc
Winkey + Tab: displays all apps as shown and offers you to choose which app to switch to
as well as it gives you chance to add another desktop app and put any apps into it
Winkey alone: display the start menu