Multiplayer networking with physics
https://ikrima.dev/ue4guide/networking/network-replication/physics-replication/
https://gamedev.stackexchange.com/questions/35459/multiplayer-networking-with-physics
Rendering thread
https://docs.unrealengine.com/4.27/en-US/ProgrammingAndScripting/Rendering/ThreadedRendering/
Explain P2P networking framework
This is a good example for explain P2P networking framework. Overall, No authority server in networking is P2P networking framework.