https://pragprog.com/titles/swdddf/domain-modeling-made-func...
Although it may look like just Domain Driven Design (DDD) and F# from the title. I think I've learnt a lot more from it. It changed the way I approached a problem and I somehow keep coming back to the book to get a refresher of the teachings in it. I suspect it is due to the influence of F# and functional paradigms that is also being shared in the book.
Direct youtube[1] for those who don't want to click twice :)
Really well done, and such a easy read as well.
It's not that it's revolutionary, but it one of those things that once you read it both seems obvious and also makes you wonder why we do things any other way.
It completely changed the way I thought about the role of type systems -- and I don't even mean in terms of monads, functors, or any other higher level category theoretic stuff. I mean just the day-to-day business coding idea of representing more of your domain directly in the type system.
I now find that pencil and paper is the best programming tool. It's massively easier to iterate on types and arrows between them than it is to pluck away against and refactor actual implementations.