Linux Tips & Tricks - Securing your Linux box
You wouldn't go home from work at night and leave the windows open and the doors unlocked, so don't do the same thing with your computer.
Every computer communicates through a set of semi-standardized "ports". Like windows or doors in your home, leaving them open is an invitation to criminals, vandals, and mischief makers.
Before you can lock your windows and doors, you need to know which ones are open. Here's how.
Note: The next step is to close the open ports with your firewall, but that's another topic.
https://www.cyberciti.biz/faq/unix-linux-check-if-port-is-in-use-command/
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