Tracking changes and adding comments in Excel are essential features for collaboration, especially when multiple users are working on the same workbook. These tools help you keep track of edits, provide feedback, and ensure that everyone is on the same page.

1. Track Changes: This feature allows you to monitor who made changes to the workbook, what changes were made, and when they were made.
2. Comments: Comments are notes that you can attach to cells to provide additional information or feedback without altering the actual data.

To enable Track Changes in Excel:

1. Open the Workbook: Open the workbook where you want to track changes.
2. Go to the Review Tab: Click on the Review tab in the Ribbon.
3. Track Changes: Click on Track Changes in the Changes group, then select Highlight Changes.

4. Highlight Changes Dialog Box: In the Highlight Changes dialog box, check the Track changes while editing checkbox. You can also specify which changes to highlight (e.g., changes since the last save, changes made by a specific user, etc.).

5. Click OK: Click OK to start tracking changes.

1. View Changes: To view the changes, go to the Review tab, click Track Changes, and select Highlight Changes. Ensure the List changes on a new sheet checkbox is checked to see a detailed list of changes.
2. Accept/Reject Changes: Click Track Changes and select Accept/Reject Changes. This will open a dialog box where you can review each change and choose to accept or reject it.

1. Add a Comment:
   • Select the cell where you want to add a comment.
   • Go to the Review tab and click New Comment in the Comments group.
   • Type your comment in the comment box that appears.

2. Edit a Comment:

   • Select the cell with the comment.
   • Go to the Review tab and click Edit Comment.
   • Make your changes in the comment box.

3. Delete a Comment:

   • Select the cell with the comment.
   • Go to the Review tab and click Delete in the Comments group.

4. Show/Hide Comments:

   • To show all comments, go to the Review tab and click Show All Comments.
   • To hide all comments, click Show All Comments again.

You are collaborating on a sales report with your team. You need to track changes to ensure accuracy and add comments to provide feedback on specific data points.

1. Enable Track Changes:

   1. Open the sales report workbook.
   2. Go to the `Review` tab.
   3. Click `Track Changes` > `Highlight Changes`.
   4. Check `Track changes while editing`.
   5. Click `OK`.
   

2. Add a Comment:

   1. Select the cell with the sales figure you want to comment on.
   2. Go to the `Review` tab.
   3. Click `New Comment`.
   4. Type: "Please verify this sales figure."
   

3. View and Accept/Reject Changes:

   1. Go to the `Review` tab.
   2. Click `Track Changes` > `Accept/Reject Changes`.
   3. Review each change and click `Accept` or `Reject`.
   

1. Open a new Excel workbook.
2. Enable Track Changes.
3. Make some edits to the workbook (e.g., change cell values, add new data).
4. Add comments to at least three different cells.
5. View the changes and accept/reject them.
6. Show all comments and then hide them.

1. Enable Track Changes:

   1. Open a new workbook.
   2. Go to the `Review` tab.
   3. Click `Track Changes` > `Highlight Changes`.
   4. Check `Track changes while editing`.
   5. Click `OK`.
   

2. Make Edits:

   1. Change the value in cell A1 to "100".
   2. Add "New Data" in cell B1.
   3. Change the value in cell C1 to "200".
   

3. Add Comments:

   1. Select cell A1, go to the `Review` tab, click `New Comment`, type "Check this value".
   2. Select cell B1, go to the `Review` tab, click `New Comment`, type "Is this data correct?".
   3. Select cell C1, go to the `Review` tab, click `New Comment`, type "Verify this change".
   

4. View and Accept/Reject Changes:

   1. Go to the `Review` tab.
   2. Click `Track Changes` > `Accept/Reject Changes`.
   3. Review each change and click `Accept` or `Reject`.
   

5. Show/Hide Comments:

   1. Go to the `Review` tab.
   2. Click `Show All Comments` to display all comments.
   3. Click `Show All Comments` again to hide all comments.
   

Tracking changes and adding comments are powerful features in Excel that facilitate collaboration and ensure data accuracy. By mastering these tools, you can effectively manage and review changes, provide feedback, and maintain a clear record of edits in your workbooks.