I'd be cautious following simple commands and configs without explanation or knowing what they do. And when someone copies public keys via clipboard I'm skeptic. Use ssh-copy-id or at least scp. And with Hetzner you can add your public key to their panel and it will be automatically added to every installation.

As it is stated, this is just a journal / checklist for someone and made publicly available. Don't blindly follow such things without understanding what you are doing.

Thiiiiis is what I've been looking for, thank you

Coolify is mentioned in the title but never in the article, unless I missed it

It would be really nice to have ansible playbooks with the instructions