Excel files are called workbooks. When you start a new project in Excel, you need to create a new workbook. You can do this in different ways:

1. Create a blank workbook.
2. Use a predesigned template.
3. Open an existing workbook.

About OneDrive

OneDrive is an online storage service that comes with your Microsoft account. When you save or open a workbook, you can use OneDrive to store your files. To use this feature, you need to sign in to Office.

To learn more about OneDrive, visit the lesson on Understanding OneDrive.

This makes it easy to keep your files safe and accessible from anywhere.