I have just published a comprehensive guide how to install HAOS in an air-gapped system. Useful when the target HAOS server cannot be connected to the network, but also useful even if you are connected to the network but have no Internet access. Focus is on x86-64 CPU architecture.
My guides are detailed and can be followed by anyone, complementing the official guides. No need for rocket science degree to get HAOS up and running.
Feedback welcome.
I have a lot of guides coming for HA and general homelab. Cloudflare, Tuya, Sonoff, Android TV, Frigate, Omada guides going live soon.