I have published the first part of a multipart series, HowTo Setup HAOS. If you are new to HA this series should accelerate your HA understanding and hopefully enable you design better systems.
HowTo setup HAOS - Part 0 - Architecture & Design
Please consider reading my other step-by-step detailed guides:
Superguide installing Proxmox VE 7.1
HowTo install Tailscale on Debian, Linux, Proxmox, Ubuntu, Windows
HowTo install Home Assistant (HA) OS in ProxMox VE 7.1