Super key – Brings Activity
Alt + F2 – For quickly running commands
Alt + Tab or Super + Tab – Switch between the running applications
Super + A – Show the list of applications.
Super + Page Up or Down – Switch between workspaces
Ctrl+Alt+Delete – Power Off
Super + L – Lock the screen
Super +M – Bring down the notification tray
Ctrl+Super+D – Minimize all the windows and show desktop