World creation

Hi there,

I’ve been following multiple tutorial to build games, but mostly are platform based.
Now i’m looking to create a world like runescape/diablo, view from above, camera follows third person.
Basicly, how do i build such world? It doesn’t go from scene to scene im pretty sure.
But i haven’t been able to find a solid tutorial/video on explaining how to build such a world.
Anyone can shed some light on this?

Many games use “Chunks” (smaller, faster to load parts of the world" to load from memory when the player is near/in them, and then unload them when they are not needed anymore.