logs and which ones to del?

[tyler]

Hay,
When I go to /var, I se a ton of stuff.
when I go to /var/log, I see a bunch of .gz files, can I del those?
I have logrotate installed, so I am assuming it just wipes the old logs, and 
backs those up.
Also, how do I know which logs to read? If I spent all my time reading logs, 
life would get boring.
Thanks,
Tyler Littlefield.
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