Hi there!

Setting reminders in Excel can be a useful way to keep track of important dates and events. Here's how you can do it:

1. First, decide which cells you want to use for your reminders. You can choose any cell or range of cells that you like.
2. In the cell where you want to set a reminder, type in the date of the event or deadline. For example, if you want to set a reminder for a meeting on June 15th, 2022, you would type "6/15/2022" into the cell.
3. Next, select the cell where you just entered the date. Then, go to the Home tab in the Excel ribbon and click on the Conditional Formatting button.
4. In the dropdown menu, select "New Rule".
5. In the "New Formatting Rule" dialog box, select "Use a formula to determine which cells to format".
6. In the formula box, type in the following formula:
   Formula:

   =TODAY()+30A1 

   This formula will highlight any cell where the date is within 30 days of today's date. You can adjust the number of days by changing the "30" to a different number.
7. Click on the "Format" button to choose how you want the cell to be formatted when the condition is met. For example, you could choose to have the cell turn red and display a message like "Reminder!".
8. Click "OK" to save the formatting rule.
9. Repeat these steps for any other cells where you want to set reminders.

Now, whenever you open your Excel spreadsheet, any cells with reminders that are coming up within the next 30 days will be highlighted and formatted according to your chosen settings. You can adjust the formula and formatting as needed to suit your needs.