There's a really interesting episode of the Reply All podcast that acts as a good explainer for dropshipping from the perspective of people who are encountering it in the wild and have no idea what to make of it. I found it useful as someone who has seen a lot of ads for dropshipped products on instagram and elsewhere but didn't understand how exactly the method was making money and for whom.

https://gimletmedia.com/shows/reply-all/dvhe3l