Suprise, I'm putting together training courses that teaches you how to think reactively. You'll learn the fundamentals such as what an operator is and how you can use them to build better, cleaner and more testable applications using the Reactive Extensions. Head on over and signup to be notified when the first course drops.
Fun fact, the Mono Linker project started ten years ago during the second edition of the Google Summer of Code!
It was originally used to reshape the entire Mono class library into a subset to expose the Silverlight class library API surface for Moonlight and then evolved to link iOS and Android applications.
Xamarin University added a new Xamarin Certified Mobile Professional certification level for developers to demonstrate fundamental competency in Xamarin mobile development. They're also making all of the required courses in the Xamarin Certified Mobile Professional certification available to trial users for FREE through their redesigned Self-Guided Learning portal.