Dennis O'Reilly began writing about workplace technology as an editor for Ziff-Davis' Computer Select, back when CDs were new-fangled, and IBM's PC XT was wowing the crowds at Comdex. He spent more ...

To add a formula in Google Sheets, click the cell where you want the answer, then choose one of the hundreds of functions.

To apply data validation rules to a selected cell or range, head to the "Data" tab on the ribbon, and click the top half of ...