The readme has more details.
I’m not affiliated with Ericsson nor Erlang Solutions, but for those wanting to give OTP a try and have yet to, it’s super easy to get installing via https://www.erlang-solutions.com/resources/download.html
Here’s a hello world example you can use. Type erl in your console to get the Erlang shell. Then:
1> S = self().
2> A = fun() -> S ! hello_world end.
This will showcase processes (which enable concurrency) and message passing to whet your appetite.
Also I really enjoy elixir, the ruby like language built on top of the erlang vm. I recently built a raspeberry pi connected device with it.