Xamarin is a Microsoft-owned San Francisco-based software company founded in May 2011 by the engineers that created Mono, Xamarin.Android and Xamarin.iOS, which are cross-platform implementations of the Common Language Infrastructure and Common Language Specifications
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Chapters
Getting started with Xamarin.Forms
Why Xamarin Forms and When to use Xamarin Forms
Xamarin Forms Layouts
Xamarin Relative Layout
Navigation in Xamarin.Forms
Xamarin.Forms Page
Xamarin.Forms Cells
Xamarin.Forms Views
Using ListViews
Display Alert
Accessing native features with DependencyService
DependencyService
Custom Renderers
Caching
Gestures
Data Binding
Working with Maps
Custom Fonts in Styles
Push Notifications
Effects
Triggers & Behaviours
AppSettings Reader in Xamarin.Forms
Creating custom controls
Working with local databases
CarouselView – Pre-release version
Exception handling
SQL Database and API in Xamarin Forms.
Contact Picker – Xamarin Forms (Android and iOS)
Xamarin Plugin
OAuth2
MessagingCenter
Generic Xamarin.Forms app lifecycle? Platform-dependant!
Platform-specific behaviour
Platform specific visual adjustments
Dependency Services
Unit Testing
BDD Unit Testing in Xamarin.Forms
Source; goalkicker.com