Firewalld is a firewall management system for Linux that allows admins to create custom rules to control network traffic. It's designed to be much more user-friendly than the older style of managing firewalls, which requires editing configuration files (and risking breaking something). Firewalld also supports IPv6 features like NAT and port forwarding to act as a proxy or gateway between two networks.

Here's a tutorial on managing Linux firewalls with Firewalldtutorial on managing Linux firewalls with Firewalld that I found very helpful. It begins by describing how firewalls work and why they're important. It then explains how Firewalld works and how it differs from other methods of managing networks before providing an example of how to use Firewalld with a specific program called SSH. Check it out! 

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