If you want to learn more about this in person, in 2020 there will be the first "Online Game Technology Summit" at the Game Developers Conference.
(Disclaimer: I'm one of the summit advisors)
We're trying to grow the education in this space of game development, because currently it is very sparse. AFAIK, this is the only event that is dedicated to the technical aspects of online, connected or multiplayer games.
Details, and CFP, which is currently open: https://www.gdconf.com/summits/c4p