idroot published a tutorial about how to setup Firewall using FirewallD on CentOS 8.
How To Setup Firewall using FirewallD on CentOS 8
In this tutorial we will show you how to setup Firewall using FirewallD on CentOS 8, as well as some extra required package by FirewallD
How To Setup Firewall using FirewallD on CentOS 8 - idroot