There’s an aspect of product; that is, the answer to the question: “What is a marketable product / service from this effort?”
I went part way to a few answers to that once. “What if it was to write a book?” so I experimented with several ideas on Amazon, up to the point of marketing, but not including marketing.
So, now i know the process to follow; the series of steps to take books to get them saleable.
But a marketable book with content desirable enough for a sufficient audience to make the marketing effort required justified for the income it would produce? Well, that’s another matter.