How to Install and Configure UFW Firewall in Linux Debian 11.3

UFW, or Uncomplicated Firewall, is an interface to iptables aimed at simplifying firewall configuration. While iptables can be difficult for beginners to master in order to set up a firewall properly.
For more explanation on this video: https://www.linuxhelp.com/how-to-install-and-configure-ufw-firewall-in-linux-debian-11-3