This tutorial demonstrates how to build a robust and extensible GraphQL API using Hot Chocolate GraphQL server and integrating it with Hasura via Remote Schema. The steps include setting up prerequisites, creating a new .NET Core Web API project, installing Hot Chocolate GraphQL in the project, defining data models, creating dataset, defining data resolvers, configuring the GraphQL server, executing GraphQL query, creating a public endpoint for the GraphQL API using ngrok, and finally merging data with Hasura Remote Join. The resulting unified GraphQL API combines data from both local and remote sources.