NetCode DOTS

Hi, there are a couple of questions about your new network code. I’m very interested in how UDP data transfer is arranged for you, whether you use sockets with select or implemented as LibUV. And can there still be a new system in hi-load? Is it worth it to implement a MMORPG shooter, can it withstand a huge number of players? And yet, in general, what kind of data is being chased through sockets? When one player presses the go in front button, what transfers the server to other players? Will I be able to implement a layer system? So that the players were on different layers, for example, two layers of 1000 players do not see each other. and do not interact. please for more details, and I'm sorry for my English, I am from Russia, and it is difficult for me to find similar information in Russian, so I decided to ask a similar question.