Bitcoin + websocket server, how to hang events?

Question

Node.js

Hello. Please help me understand the essence of the websocket server for bitcoin...
In general, I want to do this:
when a new block arrives - send a notification to all users
on a new confirmation - send a notification to everyone
when the balance changes - also notify everyone
Here's how to do it, I don't understand what -then.
How to hang events in bitcoin, how to receive an event on a node is...
Tell me, colleagues? With a node, this is not the first project I have, but the first one with a cue ball, so I'm confused