Hello and welcome!
nengi is an open source game networking engine for node.js
The best way to learn nengi is to try the tutorial series in the right menu. A skim of the documentation is helpful too. The nengi API isn't particular big, but making multiplayer games involves thinking about everything a bit differently.
The discord channel is also fairly active, and I check it daily.
If you had an account on this website: thank you so much for helping me test nengi! The main reason to have an account was to obtain a license and download nengi. As none of that is needed anymore, I will be deleting all accounts. I intend to send out a final email eventually. Please stay in touch! I'll be active on Discord and Patreon.