More in depth firewall rules

[Jan Janowski]

I’ve been using this for the firewall rules of what’s legal or not to make a firewall rule:

Firewall | DSM - Synology Knowledge Center

Synology Knowledge Center provides you with answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.

kb.synology.com

Does any other document exist that delves into more detail of what is legal or not in firewall rules?

Thanks

 

[Jan Janowski]

Just asking again if more in-depth information or rules are available than link posted. I keep creating rules that make sense, yet are illegal.
Thanks