Yo

I would like to know or if someone could show me how you guys find all the info people request : for instance i wanna know: im trying to setup a firewall machine on my 7.0 nix box...i got the basics about iptables which im using but wanna know HOW to LOG port scans using them??. And information on what services are safe to run on a firewall machine like keylogger, nfs <---- i would like to know what these things do?( NFS is just an example i think i know what it is


Soo i go to www.google.com and i use "coppernic":
type:

port scan logging +iptables

keylogger +linux startup <----(keylogger) what it does and if i need it stuff like that

But i dont get the results very clearly like how you guys sometimes post. Was wandering if any one can help me on this.I know most of you just got the knowledge but always have a LINK too thats pretty clear . Any help on how to search better for these kinds of things: and what would u do if you needed to find info on this stuff.(any examples PEOPLE want to share like tips what they do to find the info)