A keyboard is required. Shortcuts work only with a hardware or Bluetooth keyboard attached to the device.
Views use Ctrl and a number. Ctrl+1 for schedule, Ctrl+2 for day, Ctrl+3 for week, Ctrl+4 for month, and Ctrl+0 for the 3-day view.
Moving around. Ctrl+J and Ctrl+K move to the next and previous date range, Ctrl+T jumps to today, Ctrl+G goes to a date, and Alt with the arrow keys scrolls the timeline and moves between time frames.
Events. Ctrl+N creates an event, Ctrl+E edits one, Ctrl+S saves from the details page, and Backspace or Delete removes an event.
Side panel. Ctrl+Shift+T toggles the side panel. The full set is in the table above.