How to setup firewall in Linux - add port in firewall - firewall-cmd

Setup firewall in LInux - Centos
sudo yum install firewalld
sudo systemctl is-enabled firewalld
sudo systemctl enable firewalld
sudo systemctl disable firewalld
sudo systemctl status firewalld
sudo systemctl start firewalld
sudo firewall-cmd --list-all
sudo firewall-cmd --add-port=80/tcp --permanent
sudo firewall-cmd --remove-port=80/tcp --permanent
sudo firewalld --reload

• #education
• #firewalld
• #enable_firewall
• #disable_firewall
• #installing_firewalld
• #checking_whether_firewalld_is_enabled
• #adding_firewalld_to_the_system_startup
• #removing_firewalld_from_the_system_startup
• #checking_whether_firewalld_is_running
• #starting_firewalld_service
• #listing_the_current_firewalld_configuration
• #adding_ports_to_firewalld
• #reload_firewalld_configuration
• #how_to_set_up_a_firewall_using_firewalld_on_centos_7
• #firewall_rules
• #linuxfirewall