move & select
↑↓←→ move ctrl+→ jump to edge shift+→ select ctrl+shift+→ select to edge shift+space row ctrl+space column
commands
ctrl+c copy ctrl+b bold ctrl+z undo alt opens the ribbon — pick a tab, then its keys (e.g. h v s or legacy e s for paste special; h u s for AutoSum)
flow
1/2/3 switch exercise shift+f11 restart esc cancel ribbon on the results card: enter again · space next