How to set up a firewall using FirewallD on CentOS 8

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Originally published at: https://www.cyberciti.biz/faq/how-to-set-up-a-firewall-using-firewalld-on-centos-8/

I am a new CentOS Enterprise Linux 8 sysadmin. How do I set up a firewall using FirwallD on CentOS 8?