Win+M: This shortcut minimizes all open windows and programs instantly. Comes in handy when you want to quickly go to the Windows homescreen without manually minimizing the open windows one-by-one.
Win+Shift+M: Maximize all running windows
Win+F: Open the Search window
Alt+Esc: Has the same functionality as Alt+Tab shortcut but with one difference, it toggles the windows in the order they were opened.
Win+Home: this shortcut minimizes all running programs except the one you are currently running.
Win+T: Cycle through taskbar programs, i.e. preview thumbnails one by one and once you are on the program you want to open now, hit Space or Enter
Win+ hit number (1-9): Starts the application in the taskbar in that position
Win+Up/Down: Restores or maximizes the current open window
Ctrl+Shift+N: To create a new folder in the directory
Alt+P: Toggles the preview pane in Windows Explorer
Win+G: Cycle between the Windows Gadgets on your screen
Alt+F4: When focused on the desktop will bring up Shut Down window