A very good article by  nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z about relay config:

nostr:naddr1qvzqqqr4gupzq3svyhng9ld8sv44950j957j9vchdktj7cxumsep9mvvjthc2pjuqq9hyetvv9uj6um9w36hq9mgjg8

Or here:
https://habla.news/u/vitorpamplona.com/relay-setup