This workshop is intended as a walk-through into .NET Core and ASP.NET Core 3.0 features, creating a new Web API, preparing it for production use and consuming it from client-side Blazor client. We will cover some best practices in developing REST API, implement security, create unit and integration tests for controllers, add support for Swagger, implement versioning, usage limiting, monitoring, health checks, dockerization... and finally, consume the API with Blazor WebAssembly client.