Sadly I don’t know the above offers. I can say that I liked the programming phoenix book a lot. Some things in there won’t be as up to date anymore (especially with the next Phoenix version) but it’s a good resource overall, given you already know programming that is.
What is best about this book (apart from building a real application showing off many crucial aspects of web app development with Phoenix) is that the authors of the book are also the authors of the phoenix framework. This gives you “behind the scenes” information about WHY something is done in a specific way, the trade offs and design decisions involved and not just the WHAT.
Besides that the kickstarter for Elixirsips building a forum in Phoenix is still ongoing and while I haven’t watched Elixirsips myself, the reputation and community involvement seems to be good - something I can’t say about the links you posted as I don’t know them
Really? $9 per month seems pretty good for the content that’s listed… especially considering that if you’re happy with what’s already published, you could just dig through it in a month and then cancel.
Of course, I haven’t looked at the paid content yet. It sounds like you have, and were disappointed with it… want to share why?
If you’ve worked with Rails before, things will seem very familiar. But, for the most part, Phoenix is fairly straight-forward if you have a handle on Elixir and OTP first. I highly recommend learning Elixir and writing some small OTP apps first. It gives you the context you need to understand “behaviours”. Then, as others suggested, read the Programming Phoenix book. Phoenix should serve mostly as a web service and one component of what you’re trying to deliver.
My favorite book so far is Benjamin Tan’s, The Little Elixir and OTP Guidebook. All practical examples.