Firewalls, commonly underused by home users yet probably one of the most important aspects of securing your machine; ever.
Windows users have a HUGE array of options in front of them, but GNU/Linux isn’t quite as flexible in terms of giving you a thousand and one options.
Thankfully, there is the powerful IPTables firewall built into most systems. However, IPTables can be a daunting task for people to configure and learn how to use, thankfully there are front ends and other tools that can make setting up a very powerful firewall MUCH easier for the end-user.
CSF, or ConfigServer and Firewall, is