You can easily count the number of unique values of the range using a simple formula.

To get unique items from a range, you can use the Advanced Filter to extract the unique values from a column of data and paste them to a new location.

If you need to select all objects embedded into the worksheet, e.g., select all charts to adjust their size, press Ctrl+G and click the Special button or use Ctrl to select objects individually.

Applying a number format to a cell doesn't change the value but only how the value appears in the worksheet. Formatting can play a joke with you, e.g., the sum of values seems incorrect because Excel displays a limited number of decimal places, and their sum is not equal to the real sum.

The easiest way to enter a function into a formula is to use the Excel program's Insert Function dialog box.

You can make your Excel spreadsheets more appealing by choosing a 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 for Microsoft 365 automatically creates one worksheet in each new workbook, but you can force it to create as many spreadsheets as you need.

The Excel TEXT function enables you to specify numbers and date format.

Color code is a perfect way to identify content and draw attention to it. In Excel, you can easily change the colors of one or more spreadsheet tabs (see how to group multiple sheets).