I am a newbie to managing VPS but I have gone through almost everything about setting up a VPS. I can feel the learning curve that I've been through

Now it comes to hardening the security of my VPS, I followed the below instructions:

http://rimuhosting.com/howto/ports.jsp
http://rimuhosting.com/howto/firewall.jsp

I used the Webmin control panel to do some basic security stuffs like allowing and disallowing some traffic. But I am not 100% sure if that's all.

If any of you have good ideas how to harden the security, please give me some help.

My VPS: Fedora Core 6 and Webmin control panel

Thank you!!