I've been really diving into learning OTP over the past few months. It was really hard for me to understand for a long time, but it's finally starting to click! OTP is AWESOME.
I recently gave a talk on OTP at my local meetup walking through the basics, hoping to help spare others my initial anguish of trying to understand it all. It assumes no prior knowledge of Elixir or OTP (though understanding basic Elixir syntax and its data structures is helpful).
Let me know if you enjoy the talk, would love to hear any other (kind) feedback!