Adding a text to a cell in Excel using Formula requires use of ampersand operator, CONCAT function, or the LEFT, RIGHT, and LEN functions.

However, if you've used green or blue text, cell fill, or borders, this can cause confusion. As a result, you can change the Focus Cell color to a shade you tend not to use in your spreadsheets.

Look to the Ribbon and find the Fill Color button. Choose your color and right away the cell will change. You can do the same with fonts by selecting the Font Color icon.