Excel offers many other useful functions, such as date and time functions and functions you can use to manipulate text.
To see all the other functions, click the arrow on the Sum button in the Editing group on the Home tab, and then click More Functions in the list. In the Insert Function dialog box that opens, you can search for a function. This dialog box also gives you another way to enter formulas in Excel. You can also see other functions by clicking the Formulas tab.
With the dialog box open, you can select a category and then scroll through the list of functions in the category. Click Help on this function at the bottom of the dialog box to find out more about any function.