In Microsoft Excel, if a cell contains a formula that results in an error, a triangle appears in the top-left corner of the cell. The triangle is an error indicator.

Use Microsoft Excel's TODAY() function in simple expressions to highlight the current date and past and future dates.

Learn how to create a drop-down list in Excel without or with color using conditional formatting and data validation rules.

Excel does not have a built-in feature to sum or count cells by color, but this can be achieved using three methods: Filtering with Subtotal, Name Manager with Helper Columns, or Custom VBA Functions.

Need a formula for your Excel spreadsheet in a flash? Try ChatGPT. In this guide, we'll show you how to write Excel formulas using ChatGPT.