Learning Excel’s Function Arguments
When you start to use a function it can take some time to learn the arguments required and understand what Excel expects for each argument. Eg should it be a cell or a range or either?
When you have the start of a function in the formula bar, you can either press Ctrl + a or click the fx symbol on the left of the formula bar – see image below.
In the image above, the argument in square brackets [range_lookup] is optional. Square brackets around an argument mean it is optional.
This will display a dialog with a listing of the arguments required by a function. The bold names are required, the non-bold names are optional.
This listing provides a lot more detail on what Excel is expecting for each function argument. This helps you learn more about how to create and use the function.