UFW provides an easy way to set up a firewall on Ubuntu, compared to the likes of iptables or nftables.
Follow this guide to learn more:
https://itsfoss.com/ufw-ubuntu/
Using UFW Firewall in Ubuntu Linux [Beginner's Guide]
Learn the basics of using UFW firewall to secure your Linux system in this beginner's guide.Abhishek Prakash (It's FOSS)
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