If you don't know who the spreadsheet wizard is at your company, become that person. This works in almost any company regardless of field. Once there are some more lessons here, I can see it being a great resource.

This looks like a good start, but you pretty much need to get either Google Sheets or Excel into the browser window for the exercises. The half-working thing currently there just isn't going to cut it. It was very hard to work with.

I don't know what plans you have for future tutorials, but I would suggest using specific business use cases as scenarios and exploring them from a basic approach along to more advanced solutions where appropriate.

Also, I really like the name.