I just published a 2-Part series about the Hexagonal and Onion Architectures and their combination, the Explicit Architecture. Part 1 is an introduction to the architectures and Part 2 shows an implementation of the Explicit Architecture in Elixir. Feedback is much appreciated! 
Part 1: https://youtu.be/iGTCZt9Z8A8
Part 2: https://youtu.be/617whtd2tdk
