You can't get OTP in a single bite, it's not bite sized. Learn you some Erlang for great good does its best to make it bite size. There's also getting started c

You can't get OTP in a single bite, it's not bite sized. Learn you some Erlang for great good does its best to make it bite size. There's also getting started chapters on the elixir-lang.org site that do a good job-- not as big as a book but still very useful. Best bet is to start playing with it, do simple projects or whatever and add OTP stuff as you go when you need it.