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Save, back up, and recover a file in Microsoft Office
Saving a file to OneDrive or SharePoint allows you to access it on any device and enables features such as AutoSave and Version History, which can help prevent data loss if your file closes unexpectedly. To save your file: Press CTRL+S or select File > Save. Tip: You can also select Save on the Quick Access Toolbar.
Overview of formulas in Excel - Microsoft Support
Get started on how to create formulas and use built-in functions to perform calculations and solve problems. Important: The calculated results of formulas and some Excel worksheet functions may differ slightly between a Windows PC using x86 or x86-64 architecture and a Windows RT PC using ARM architecture. Learn more about the differences.