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# systemctl enable firewalld
# systemctl start firewalld
# systemctl status firewalld

To open an incoming connection to a specific service such as SSH, you need to verify that the service is present in the firewalld rules and, then, add the rule for the service by adding --permanent switch to commands as below

# firewall-cmd --add-service=[tab]  #List services
# firewall-cmd --add-service=ssh
# firewall-cmd --add-service=ssh --permanent

If you wish to open incoming connections to other network services such as HTTP or SMTP, just add the rules as shown by specifying the service name.

# firewall-cmd --permanent --add-service=http
# firewall-cmd --permanent --add-service=https
# firewall-cmd --permanent --add-service=smtp

To view all firewall rules on the server, run the following command.

# firewall-cmd --permanent --list-all