I wanted to understand how to use Excel better, and I had some question regarding it. Which exchange site is good for this?
And as suggested by psubsee2003 in this answer:
I see you already accepted an answer, but just to add to the existing answer, I think the best Stack Exchange site depends on your exact usage.
For general Excel questions, including those dealing with built in Excel features, functions, and formulas, Super User is absolutely the correct site.