sudo firewall-cmd --add-port=80/tcp --permanent

target: default
  icmp-block-inversion: no
  interfaces: ens192
  sources:
  services: dhcpv6-client ssh http https
  ports: 80/tcp 443/tcp 8000/tcp
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:
  rich rules:

sudo  nmap -sT  {ip address}

PORT    STATE  SERVICE
22/tcp  open   ssh
443/tcp closed https

sudo netstat -tulpn

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      17859/nginx: master
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1263/sshd
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      12372/postgres
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1766/master
tcp6       0      0 :::80                   :::*                    LISTEN      17859/nginx: master
tcp6       0      0 :::22                   :::*                    LISTEN      1263/sshd
tcp6       0      0 ::1:5432                :::*                    LISTEN      12372/postgres
tcp6       0      0 ::1:25                  :::*                    LISTEN      1766/master
udp        0      0 127.0.0.1:323           0.0.0.0:*                           867/chronyd
udp6       0      0 ::1:323                 :::*                                867/chronyd

sudo ufw status verbose

Status: inactive

sestatus

SELinux status:                 disabled