ASP.NET Core comes with the following benefits over ASP.NET.
Cross platform, provide ability to develop and run on Windows, Linux and MacOS.
Open-source
Unified Platform to develop Web UI and services.
Built-in dependency injection.
Ability to deploy on more than one server like IIS, Kestrel, Nginx, Docker, Apache etc
cloud enabled framework, provide support for environment based configuration systems.
Lightweight, High performance and modern HTTP request pipelines.
well suited architecture for testability
Integration of many client-side frameworks like Angular any version
Blazor allow you to use C# code in browser with JavaScript code.