Further reading is always important to broaden your knowledge base. Let's go through some of the useful links that will help us gain more insight.
Here are a few references on Elixir:
The Elixir homepage is available at http://elixir-lang.org.
The Getting Started guide is available at http://elixir-lang.org/getting-started/introduction.html.
The Elixir documentation is available at http://elixir-lang.org/docs.html.
Packages (the Elixir package manager) can be accessed at https://hex.pm.
The source code can be accessed at https://github.com/elixir-lang/elixir.
The homepage of the Phoenix framework can be accessed at http://www.phoenixframework.org.
The Erlang homepage is available at http://www.erlang.org.
The official documentation for Erlang can accessed at http://www.erlang.org/doc.html.