Hello, as we all know the biggest problem in learning a new library or writing a clean code is a good documentation, even you are qualified dev.
My idea is to collect all ideas or create section in Xamarin.Form about communication among blocks with very very simple examples for ppl who doesnt remember how to write it in a good way or forget and ppl who start the journey with Xamarin.
- Example (COMMUNICATION -> bindings, events, passing etc.)
Properties: Custom View (Android) ->Custom View (Xamarin.Form)
Commands: Custom View (Android) ->Custom View (Xamarin.Form)
Properties: Custom View (Android) <- Custom View (Xamarin.Form)
Commands: Custom View (Android) <-Custom View (Xamarin.Form)
Properties: Custom View (Xamarin.Form) -> View (Xamarin.Form)
Commands: Custom View (Xamarin.Form) -> View (Xamarin.Form)
Properties: Custom View (Xamarin.Form) <- View (Xamarin.Form)
Commands: Custom View (Xamarin.Form) <- View (Xamarin.Form)
Best Regards 
Add examples and ideas 