The jump from learning Erlang syntax to understanding OTP is really big one and taken too early might be daunting. Perhaps consider reducing expectations you put on yourself today - that is focus on having something that works without understanding why - take a note of questions/doubts you have and come back to them later.
When you feel ready to formulate an exact problem - ask a question in a place like this forum.
You can also check my other post, which is maybe related.