What determines the load on the game server?

Question

Iron

Hi, buddy, I have a question about a game server, for example, purely theoretically, I want to run a powerful server for MMO games at home, with a huge online (we believe that it is), what do you need to have?
And is it possible to split one server into different machines?
Is it possible to have one server for players from all over the world, but so that the ping is within reason (somehow split the server into machines around the world).
What are the qualities to choose a language for writing a server?
I more or less figured out how the Internet works and protocols.
In general, I have such a mess in my head, it will not be bad if you throw some literature / articles on this topic, preferably in Russian, because it is very difficult for me to read about such things in English.