In many design tasks in this course we can read:
We can have SOAP or REST APIs to expose the functionality of our service.
IMO this sentence is misleading as SOAP is a protocol and REST is not. Also, what about GraphQL? What about internal communication? Do we need to serialize and deserialize each request? Do we really need to rely on synchronous communication? At which layer we want our load-balancing to work? And so on… I think the topic of inter-service communication is underdeveloped in this course.