Apple Numbers Functions and Syntax Examples

In my Etsy Adventures, I've been trying to find what workflow works best for the various types of tasks involved with being an Etsy seller.

I moved over to Google Sheets for most of my spreadsheet work, but I found that Apple Numbers is actually quite powerful! I can see myself using it in the future, so I wanted to document some of the formulas and syntax used in my Etsy spreadsheet work.