Seconding The Mom Test. It's a fast read too, and the author was on a recent episode of the Indie Hackers podcast.

For more of the same, I got a lot out of Lean Customer Development by Cindy Alvarez. Here's a talk from Cindy if you'd like to get to learn more before committing to a book: https://www.youtube.com/watch?v=d5hc7sseHbE