Unfortunately there are no good guides on chicken communication.
I have over 30 recorded and identified calls.
There are a few that are relatively easy to identify. A lot of observation of what actually happens when these calls are made does eventually give a valid conclusion regarding what they mean.
I wrote an article for BYC on one very misunderstood call.
https://www.backyardchickens.com/ar...-not-about-the-egg-it’s-an-escort-call.74386/Other relatively easy to identify calls are for examples;
The predator warning call given by roosters. There are two main types, one for aerial predators and another for ground predators or perceived threats.
The I've found food call.
The send chicks to cover call.
The return to mother call.
The heads up call for creatures events that are not perceived as an immediate threat.
The make nest call.
And many more.