1. Shortcut to repeat previous action F42. Shortcut to show a shortcut menu shift + F103. Shortcut to enter a date in a cell shift + ;4. To reverse the last command (undo) shift + Z5. Invoke the fill down command ctrl+ D6. Display a hyperlink dialog boxctrl +K7. To apply the bold formatting ctrl+28. Switch between Worksheets ctrl+pgdn9. To select the row of active cell shift+ Spacebar ( horizontal column ctrl+spacebar)10. Ctrl + + is used to enter the new row above the selected cell