https://unbound.docs.nlnetlabs.nl/en/latest/getting-started/installation.html
Setup Your DNS records without using a external service, like Cloudflare or others that maybe ask you to pay.
Now I just need to find the official documentation for the RelayD to be happy :)
I am not asking too much, while OpenBSD documentation for Relayd is cool, I just wish to see something similar on a dedicated site.