Getting Started with UFW (Uncomplicated Firewall) on Ubuntu 20.04

UFW or Uncomplicated Firewall is an application to manage an iptables-based firewall on Ubuntu. UFW is the default firewall configuration tool for Ubuntu Linux and provides a user-friendly way to configure the firewall, the UFW command is just like English language so the commands are easy to remember. The UFW firewall supports IPv4 and IPv6.