I suppose it depends what you are looking for, it is a bit hard for me to answer. Maybe this list might help?
If I had to recommend myself, I would suggest starting with the official Getting Started guide and check Elixir School as well.
A great way to explore different parts of the language through practice could be Elixir-koans.
And if you are planning to use Elixir for web development, the Phoenix official guide and Programming Phoenix are fantastic.
All those resources are free (except the book) and should help you get started, check what works best for you. Past some point nothing beats practicing on some real projects IMHO (and the official documentation will be a tremendous help once you do). And you can always come back at Programming Elixir later for a deeper dive into the concepts. 
