What do you need to know to develop an MMO game?

Question

Mobile development

I want to develop MMO games. I will be grateful if you advise resources, books. The engine chose Unreal Engine 4. If you can tell me the learning sequence.

Answer 1

You need to have an overkill experience in developing simpler games. The richest experience in work of network things. And an overdose of money.

Answer 2

There is a good book on this topic - Multiplayer Games. Development of network applications...
But without a good knowledge of c++ and network programming skills, you will hardly understand anything.