Cell references in Excel are like addresses that point to specific cells. Three types of Excel cell references are relative, absolute, and mixed, each with unique functions.

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

If Excel is not highlighting cells in the formula, enable 'Allow editing directly in cells' and 'Enable fill handle and cell drag-and-drop' in Excel options.