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Well your rules will depend on what services are actually running on the host. For a basic setup I recommend just configuring /etc/fail2ban/fail2ban.local, /etc/fail2ban/jail.local and /etc/fail2ban/jail.d/sshd.conf.
You will also want to harden sshd configuration.
From there, every time you add a new service with an authentication mechanism, setup a corresponding fail2ban jail/filter to check the logs for auth failures. Here are a few examples: gitea jail and filter, jellyfin jail and filter, nextcloud jail and filter.
Fail2ban comes with pre-made filters for common services, just enable the relevant jails from
jail.local
. If you need to write custom jails/filters, make sure to check that your filters work against actual log messages usingfail2ban-regex