https://blogs.msdn.microsoft.com/microsoft_press/2016/03/31/free-ebook-creating-mobile-apps-with-xamarin-forms/
Quoting:
"Microsoft Press, in cooperation with Xamarin, is pleased to publish a new ebook by legendary author Charles Petzold: Creating Mobile Apps with Xamarin.Forms: Cross-platform C# programming for iOS, Android, and Windows."
Free PDF here: http://aka.ms/xamebook
Well, as the title states we'll be addressing software development topics (mainly in English). Topics will be quick and short and most probably aligned with the training "problems", sorry, programs I am involved in. PS. Some links are "internal" (not publicly available): If you are not able to reach it, google will find you a publicly available information source for sure. Happy trails to you.