Here is a YouTube computer tutorial about 10 Tips for Hardening your Linux Servers, and is part of a growing collection of videos I have found which should be useful to you for accompling the sequence of security tweaks and additions to harden your Linux against attackers. There are thousands of YouTube computer tutorials out there, but this is a good one when you need accompling the sequence of security tweaks and additions to harden your Linux against attackers.
This tutorial, "10 Tips for Hardening your Linux Servers" is a free tutorial you can watch, which will help you understand how to get better performance, usability, and an overall better experience using your laptop or desktop computer.