Unify mobile app configuration. Learn how to setup an unique app.config on Xamarin.Forms to be consumed by android, ios, and windows phone clients, instead of creating a native configuration for each platform.
ASP.NET 5 is dead. It's renamed as ASP.NET Core 1.0 now. Lots of differences when developing web for ASP.NET 4 and ASP.NET Core 1.0. Especially the tooling. See how to develop ASP.NET Core 1.0 using the open source tooling inside Visual Studio or just using command line console.