Though not immediately relevant, it's pertinent to bring up "The Mom Test" (https://www.momtestbook.com/) book. This book offers insights into conducting customer interviews without inadvertently guiding them towards giving the answers you want to hear, or asking them to forecast whether they'll use your product.
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I searched the thread to make sure someone mentioned this because I found it very useful. It encourages you to ask customers about real experiences instead of opinions, and gives you ways to identify things they care enough about to invest time/money into.