Glad to hear the first 11 videos went well! But am definitely sorry about the jump when we start talking about Relay-specific concepts for GraphQL.
The goal was to be able to take the server we build out in this course and use it together with React/Relay. Unfortunately, in order to make sure that works we had to tackle the three big concepts for Relay-compliant GraphQL Servers:
- Node identification
If you're curious about a place to start to learn more about Relay and GraphQL, a great place to start with these topics is the Relay Docs.
If you're looking for additional resources, let me know! I can definitely provide any help on topics that are underdeveloped during this course.