[gentoo-user] Protecting my server against an individual

[Grant]

It has come to my attention that a particular person I know may be
intent on attacking my server/website in any way possible.  He doesn't
know much about Linux but does know Windows.  What kind of things
should I lock down to protect my remote hosted server?  I don't have
time to get too crazy with security right now, but what kinds of
simple tricks might this fellow learn by asking around on forums, etc?
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