the little APS.NET Core book

ASP.NET Core is a web framework created by Microsoft for building web
applications, APIs, and microservices. It uses common patterns like MVC
(Model-View-Controller), dependency injection, and a request pipeline
comprised of middleware. It's open-source under the Apache 2.0 license,
which means the source code is freely available, and the community is
encouraged to contribute bug fixes and new features