Reading a shortcut is one thing, getting it into your fingers another. Press the shortcut and watch the sheet do what Excel does. Six short drills, a few minutes each.
No need to scroll down a long list. An arrow with the right key in front takes you straight to the edge of your data.
Dragging the mouse over a hundred rows is fiddly. Hold Shift and the selection grows with every move.
The shortcuts you will use most. Undo belongs with them: trying is fine, you can always go back.
Bold, italic and underlined without the ribbon. The same shortcut again turns it off.
Edit a cell, fill a column and add up, without taking your hands off the keyboard.
Filter buttons and the Find window come up with one shortcut, and close just as fast.