@peerreynders @srowley thank you both for chiming in. (Yes, I posted the discount on the other thread, too.)
I bought the book.
I read Programming Elixir and I think the first few chapters are fantastic. But the author lost me on the advanced topics like processes, OTP, etc.
I will need to revisit that but perhaps another perspective (from Saša Jurić) can help, too.