This is a very interesting video that demonstrates the power of using DDD together with Ports & Adapters pattern. I totally agree with the concept. By using Ports & Adapters you can easily understand the business logic without having to look at boilerplate code (the ports and adapters).
The speaker recommends the book “Building Microservices - Desining fine-grained systems”. The speaker mentions that the book cover lots of ideas of DDD and ports & adapters, that it is worth reading it in case you agree with the things he speaks of.