Headers and footers are widely used in the Microsoft Word document, but you should know that Excel has headers and footers too.
You can make your Excel spreadsheets more appealing by choosing graphics file to serve as a background for a spreadsheet similar to the wallpaper that you may display on your Windows desktop.
If you prefer to avoid the empty workbook to be created when Excel starts up, you can do so by editing the command line that is used to start Excel.
Excel 2016 automatically creates one worksheet in each new workbook, but you can force it to create as many worksheets as you need.
The Excel TEXT function enables you to specify numbers and date format.
Using the Hide command you can hide the data and formulas from "inquisitive minds". But some of them still can use Unhide command. Nevertheless you can completely hide Excel spreadsheet so that it will be needed some VBA programming to unhide it.
Excel offers you an ability to assign user-level permissions to different areas on a protected spreadsheet. You can specify which users can edit a particular range while the spreadsheet is protected. As an option, you can require a password to make changes.
With Excel built-in tools you can easily work together on workbooks and monitor who, when and what changes made. E.g., track project status and tasks.
Working with large and complex Excel workbooks, especially when entering large amounts of data, no one is protected from accidental changes in formulas, formats and other spreadsheet elements. But you can protect yourself from too much work on finding and eliminating such errors by protecting the individual spreadsheet elements.