Honestly, only tangentially (at best). Nitrogen is fundamentally an Erlang web framework, however the OTP skills learned should be universal. but we don't dive too deeply into OTP. We introduce gen_servers and supervisors and leave it at that. Most of the book is spent with the specifics of Nitrogen.

That said, the demos[1] on the Nitrogen homepage can give you a pretty good sampling of how the framework works.

[1] http://nitrogenproject.com/demos