The .NET team has published some E-Books for planning and building microservices, container-based applications, web applications, and mobile apps based on Xamarin.Forms in the .NET Application Architecture Center.

.NET Microservices Architecture eBook
https://www.microsoft.com/net/download/thank-you/microservices-architecture-ebook

.NET Microservices DevOps eBook
https://www.microsoft.com/net/download/thank-you/microservices-devops-ebook

ASP.NET Architecture eBook
https://www.microsoft.com/net/download/thank-you/aspnet-ebook

Xamarin.Forms Architecture eBook
https://www.microsoft.com/net/download/thank-you/xamarin-ebook