Help to understand the workflow to deploy a multiplayer game

This is very scary that the engine is updated and the courses by epic is getting older on blueprint, and for C++ I don’t see any official course.
This is also scary that many of non-official courses created by other instructors on udemy is also for kids to create cartoons and not games :D… we want a proper course for multiplayer game from the officials and not from third parties.
An example can be a battle royal game which is the best task to cover everything.