Worked through the following ebooks:
Programming elixir
Programming Phoenix
Metaprogramming Elixir
What’s new in Ecto 2.1
The plataformatec blog has some great posts too. ‘Mocks and Explicit Contracts’ is the post I refer everyone to when they start testing elixir.
I read through the Programming Elixir book too. Then I tried my hand at writing an IRC server and a coupon code applicator just to toy around with the language. (These are not exemplary examples of Elixir code at all!)
From there I re-wrote a Rails app into a Phoenix app. I think I toyed around with some other app ideas too but I don’t have those on GitHub.
Then I started a new job where I am using Elixir / Phoenix daily, and that has been by far the best learning experience 
I’m currently implementing C node (client) following the Erlang docs so I can run some opencv related processing, there isn’t much material and the fact I’m doing this on Windows makes that worse. But I just got the bare minimum to work today! Learned a few things and probably will write a blog post about this. The best learning experience comes from doing!
A friend at work snuck some Elixir into our codebase and eventually showed me, and I immediately liked it. That was about 2 months ago, and since then I worked through “Take Off With Elixir”, most of the Elixir School and am about halfway through “Programming Phoenix”, although there are a couple of errors or outdated bits in it. At work I have a Safari books subscription and used it to read the first chapter or so of the Little OTP Book which seems really nice.
Although I don’t feel like I understand enough Phoenix to be useful, it seems like about the right time to jump in and try to make something, which will result in a huge mess and then I’ll figure it out.
I read Part I of Programming Elixir 1.2, of which I probably learned 15% of the material. I then bought the video packs on learnelixir.tv and learnphoenix.tv, both of which helped out enormously (hopefully they will be updated for new versions in the future). Recently, I signed up for Dave Thomas’s Elixir for Programmers course, which is also helping a lot.
I couldn’t agree with this more. I’m hoping to dive in soon, with everything I have learned, and build an application that I have been thinking about.