Apply sensitivity labels to your files and email - Microsoft Support
The sensitivity bar makes it easy for you to see what label is applied to your file, and to apply or change a label whenever you need to, including when saving the file. Just select the sensitivity bar in the save dialog to see the labeling options for this file.
Consolidate data in multiple worksheets - Microsoft Support
To summarize and report results from separate worksheets, you can consolidate data from each sheet into a master worksheet. The sheets can be in the same workbook as the master worksheet, or in other workbooks. When you consolidate data, you assemble data so that you can more easily update and aggregate as necessary.
Share your Excel workbook with others - Microsoft Support
Collaborate on Excel workbooks at the same time with co-authoring. Learn how to use the new simplified sharing feature in Excel. Now it's easier to share your spreadsheet with others on SharePoint, OneDrive, or OneDrive for Business.
Getting started with Quick access - Microsoft Support
What is Quick access? Quick access makes it simple to find your frequently used storage locations, including recently used shared libraries, channels, and folders.
Excel not responding, hangs, freezes or stops working
This article discusses troubleshooting steps that can help resolve the most common issues when you receive an Excel not responding error, Excel hangs or freezes when you launch it, or open an Excel workbook. These types of problems may occur for one or more of the reasons listed below.