I am a newbie in gamedev, and I don't know about programmer's problems that can appear during development.

So can you advice me some best practice for starting build new online multi-player game backend?

I just saw reddraft server, and I think Spring library can also do some of its features. What is big difference? Do I need learn more spring or I have to use servers like reddraft or write these tools myself?

I know that I need to learn hard and many - and the question is - what I should to learn now at the beginning?

Thanks.