In Microsoft Excel, you can add Notes to your cells. When the cell has a note, a red indicator will appear at the corner of your cell. If you hover the cursor over the cell, the note will appear.

Readers offer their best tips for strikethrough text in Excel, browsing journal articles quickly, and taking quick web-based notes. Every day we receive boatloads of great reader tips in our inbox, ...

I always make sure to add clear instructions to any shared Excel workbook so the next person knows exactly how to interact with my spreadsheets. For years, I relied on the built-in notes and comments ...