As a binge reader, I can encourage you to read the book series from PragProg.
I can recommend in order:
Programming Elixir <= 1.6
Programming Phoenix <= 1.4
After these two books, you’ll be ready to tackle some basic, medium tasks.
Programming Ecto, Designing Elixir Systems
with OTP and Testing Elixir should be the next steps IMHO.
Exercism.org and Codewars.com are also good resources to learn by solving problems too.
For quick help, usually I try to reach the Discord server or lookup for a similar topic on elixir-forum.
We’re lucky to have pragprog editing so much books about Elixir that’s insane.