As we know that MS excel plays an important part in the life of programmers, managers, scientists, engineers, statisticians, etc. Shall we add a comprehensive course in excel for our high school students in CS? It will definitely help them in a long run. Here are some of the sites which show the use of MS excel. There are a lot more uses.
https://www.goskills.com/Excel/Resources/Uses-of-Excel-in-business
https://www.wallstreetmojo.com/uses-of-excel/
https://magoosh.com/excel/10-best-uses-microsoft-excel/
and many more .........