I'm a big fan of GraphQL and HotChocolate is the GraphQL server of my choice when building .NET applications. If you are new to HotChocolate I can recommend having a look at the workshop that is available on their Github.
Unfortunately this workshop is still for .NET 5.0 and HotChocolate 11. I'm working on porting the workshop to HotChocolate 13, the latest version on the moment of writing this post.
If you want to checkout this version, you can find my fork here: https://github.com/wullemsb/graphql-workshop
Remark: I have planned to provide the updated version as a pull request once I’ve ported everything.