Using keyboard shortcuts
To typing in selected area, select a range of cells. The borders of the selected range are clearly defined:
To move vertically downward within the selected range, press Enter.
To move vertically upward, press Shift+Enter.
To move horizontally to the right, press Tab.
To move horizontally to the left, press Shift+Tab.
To move from one corner to the other corner of the range, press Ctrl+. (Ctrl and a period).
Screenshot // Fast Typing in Selected Area