I am aware of Which computer science / programming Stack Exchange sites do I post on? but it does not, specifically, handle my question, as Excel could be on topic for multiple sites depending upon the specifics of the question. The duplicate offers a very broad overview of a variety of sites, but does not consider Super User as the answer below mentions, which makes this not a duplicate.
Which Stack Exchange is the best site to ask questions about Microsoft Excel (as well as potentially other Microsoft Office and VBA questions)?