This site is designed to help you quickly learn how to develop web applications using ASP.NET Core and ASP.NET Core MVC. It includes links to tutorials, documentation, samples, blog posts, training classes and training courses, as well as eBooks and open source starter kits.
The quickest way to get up to speed with ASP.NET Core is through an online class. Instead of taking hours to read a book or spending a lot of time delving through documentation, for about the same price as a book you can get through the ASP.NET Core Quick Start in an afternoon (especially if you're able to watch it at 1.5x speed, like this reviewer).
If your team needs remote training and you don't think a recorded online class will meet your custom needs, you can schedule a custom course and/or remote mentoring hours. If you check the credentials, you'll see that a great deal of the official ASP.NET Core documentation was written by this instructor and his team.
In addition to remote mentoring and training, and instead of having someone come on site, you can send your team to learn about ASP.NET Core from Steve Smith at workshops he offers at Codemash and DevIntersection conferences.