Yep, that's the liveview one I started with :) They have a general Elixir/OTP one too: https://pragmaticstudio.com/courses/elixir - which is the one I mentioned in my other comment (in addition to the discount code LIVEVIEW).

I really like that course because you basically hack a web server together, and then refactor it to be kind-of like the Phoenix architecture, which for me is the perfect way to learn something like that. Toward the end they do the same with GenServers - hack together a stateful server, and then refactor it so it looks like a GenServer, before introducing the actual thing as a drop-in replacement. That's where I've got up to so far, but I'd definitely recommend that course if that sort of thing appeals to you and you like their teaching/video style.

That book looks great too, thanks for sharing :) Reading the author section, I'm definitely tempted to pick up a copy.