Getting started

I read getting started, and went through the onboarding but general concepts are alien to me.
I created a tailscale network beforehand. I'm running the onboarding on a large VPS. 32GB RAM 10 CPU, 2TB Storage.
I have connected whatsapp business and signal, created the discord bot, but don't know how to invite it.
And I want to harden the setup. The Security page or maybe it was elsewhere more or less says "run the onboarding and it will secure it",
But it doesn't seem like it does.
Also the brew installed stuff couldn't install because it didn't check if brew is installed on this VPS.
How do I harden the installation?
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