How can I create an online multiplayer game?

Hello, I’m new to Unreal and I want to make a MMORPG but I can’t find info on how do I connect the game to a server.

I was thinking to make a server in NodeJS or something similar since I need to persist data on a database, but all I found on youtube are videos about “Steam Multiplayer” which I don’t understand what is either.

I would recommend watering this: How to host a Unreal Engine Dedicated Server on Amazon GameLift (Part 1/2) - YouTube

What NodeJS server would do and how it would play with state of the game, you plan to use actual UE4 server?