Named ranges (also known as defined ranges) are a powerful feature in Excel that allows you to assign a symbolic name to a cell, range of cells, or formula. These defined names are a convenient replacement for the address of a cell, data range, or formula in other formulas, charts, diagrams, shapes, etc.

Excel proposes different ways to sort data. You may sort your data in alphabetical order, according to the background or text color of the data, etc.
In some cases, you may want to sort your data in non-standard ways. For example, if your data consists of month names, you usually want it to be ordered by month numbers rather than alphabetically.

Headers and footers are widely used in Microsoft Word documents, but you should know that Excel also has headers and footers.
The header shows the information at the top of every printed page. The footer shows the information at the bottom of every printed page. By default, new workbooks do not have headers or footers.

This tip describes shortcut keys that can be useful for adding, deleting, moving, or coping spreadsheets. See also how to change the color for worksheet tabs, making the spreadsheet very hidden.

While working in Excel, you may need to find certain types of cells in your worksheets. For example, cells that contain comments, formulas, or only formulas with errors. See how to select all the embedded charts on the worksheet and how to select a large data range in one click in Excel.

You can instantly find and edit data and text without manually combing through printed or handwritten pages while working with documents or spreadsheets on your computer or laptop. Word provides a convenient "find and replace" feature that allows you to use wildcards.

If you open a workbook created in an older version of Microsoft Excel, you may see Compatibility Mode near the filename in the title bar:

The default file format for files created in Excel for Microsoft 365 is the .xlsx format. You can easily save a workbook, spreadsheet, or even selected area in various formats such as .xls, PDF, HTML, etc. See also how to save workbook in .xls format or PDF format.

The PDF file format is widely used because there are many free programs, applications, and websites for viewing PDF files and the official free Adobe Reader program. A significant amount of modern professional printing equipment has hardware support for the PDF format, which allows you to print files in this format without using any software.

By default, Excel saves all workbooks in the newest format (*.xlsx), but you can change the default format to *.xls or anything else.