I recommend the official book written by Chris Mccord for Phoenix. For Elixir, I really enjoyed doing the assignments on Exercism. I also enjoy reading the elixir forum, and the slack community has helped me with a couple roadblocks in the past. But really, I think the best way is to just pick a project idea, and start working on it. It works best for me learn while doing. I hope you enjoy Elixir too!