Many people (myself included) expected that Excel 2019 would get co-authoring features, but that's not the case. To get live collaboration in the Excel desktop client, you have to be an Office ...
Excel includes many common functions that can be used to quickly find the sum, average, count, maximum value, and minimum value for a range of cells. In order to use functions correctly, you'll need to understand the different parts of a function and how to create arguments to calculate values and cell references.