Answer:
In the insert function dialog box, click the function name to get a short description ( A )
Step-by-step explanation:
Clicking the function name inside the insert function dialog box will bring up a short description of the function. or simply hovering your cursor over a function that you intend to add to your document under the insert tab will as well give a brief description of the function.
opening help from the backstage view to find a list of functions is another way but it a very long and frustrating way because there would be alot of functions found and finding an exact function and its description wont be easy.