What are the most basic steps taken to secure a multi-user Debian System on a LAN?

Hello.  I am new to the Linux World.  What are the most basic steps taken to securing a multi-user Debian System on a Local Area Network?
llvllar1onAsked:
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ravenplCommented:
Keep it up2date (ie on daily basis) ;)
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llvllar1onAuthor Commented:
A little more elaboration for the 125 points please.  Not too much but at least more than the above links. =)
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cjl7freelance for hireCommented:
apt-get update
apt-get upgrade

Or with more body (elaborated for you...)
As root run apt-get update and apt-get upgrade on a daily basis! (as previously stated by ravenpl).

//jonas
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