Windows key + T: Cycle through the apps (including pinned apps) on the taskbar.
Windows key + [Number]: Open the app pinned in the [number] position on the taskbar. For example, if you have Edge pinned in the first position on the taskbar and you click Windows key + 1, Edge will open. If the app is already open, a new instance or window will open.
Windows key + Alt + [Number]: Open the right-click menu for the app pinned in the [number] position on the taskbar.
Windows key + D: Show or hide desktop (Windows key + , will display the desktop briefly).