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.

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

Can Excel sort by color? Absolutely. In addition to sorting by values, Excel can sort by cell color, font color, and cell icon. First, you must you must define the colors for your sort columns/fields.

Counting records or values in Microsoft Excel is easy. Counting individual cells by their fill color definitely isn't. Using an old function and a matrix tames the problem.