Elixir in Action is in a class by itself. I'd also recommend Phoenix in Action as a nice quick start and the many, many Elixir books from Pragmatic Bookshelf. I

Elixir in Action is in a class by itself. I'd also recommend Phoenix in Action as a nice quick start and the many, many Elixir books from Pragmatic Bookshelf. I've read almost all of them and all of them are well-written and well-edited. Also, the official docs and guides are fantastic once you have your bearings.