firewall
 

i realize this is probably pretty stupid and i'm sure its covered in here somewhere but i am too hot and tired to look
i just did some security check on my system from a website and it keeps telling me i should use a firewall because i am not secure i can open up the firewall-config but i haven't got even the slightest clue what to do
i clicked "new" and another window popped up with a bunch of things that doesn't make any sense to me at all please help

Firestarter is a simple and easy firewall tool.

Basically, you want to have the firewall block all ports for services you do not need. Which is probably all.