With .NET Core, Microsoft has started a new era for developing multi-platform software. ASP.NET Core web framework is written from scratch, works on all major platforms including Window, Linux, MacOS - and even on RaspberryPI, and brings all-around extraordinary performance. After the short introduction, we'll look into what's new in version 3.0 and through demos analyze the basic templates for web and API applications, connecting with client-side frameworks as well as using the console and IDEs.