There are two main ways to collaborate with others on an Excel workbook:

1. Co-authoring in OneDrive or SharePoint:

This method is ideal if you're using Microsoft Excel within Microsoft 365 and your collaborators have access to OneDrive or SharePoint. Here's how it works:

* Save your workbook to OneDrive or SharePoint: Upload your Excel file to OneDrive or SharePoint online storage. This allows real-time co-editing.
* Share the file with editing permissions:
- Right-click on the file and select "Share."
- Enter the email addresses of the people you want to collaborate with.
- Ensure the "Allow editing" checkbox is selected.
- Add a message (optional) and click "Send."
* Co-edit the workbook: Once your collaborators receive the link, they can open the file in Excel Online or the desktop app and start editing.
- Excel will highlight the cells currently being edited by others with different colors.
- You can see who made specific edits by hovering over the colored cell.

2. Sharing a static copy with comments:

This method is useful if you don't have Microsoft 365 or your collaborators don't have access to OneDrive or SharePoint.

* Save a copy of your workbook: Create a copy of the original file for sharing to avoid accidentally modifying the main version.
* Share the copy with your collaborators: You can share the copy via email, cloud storage services, or any other file-sharing method.
* Use comments for feedback:
- In Excel, highlight the cell you want to leave a comment on.
- Go to the "Review" tab and click "New Comment."
- Type your comment and click "Post."
- Your collaborators can add their comments as well, creating a discussion thread within the spreadsheet.

Here are some additional things to keep in mind when collaborating on Excel workbooks:

* Communicate and plan: Discuss who will be responsible for different parts of the workbook and agree on a communication plan for updates and questions.
* Version control: If using static copies, consider using version numbers or timestamps in filenames to avoid confusion over which version is the latest.
* Resolve conflicts: In rare cases, co-authoring might lead to conflicts if multiple users edit the same cell simultaneously. Excel will usually prompt you to choose the version to keep.

By following these tips, you can collaborate effectively with others on your Excel workbooks and ensure everyone is on the same page.