question about security logs

[Tahis Vera <tahis.vera () gmail com>]

Hi all, 
Pardon me if the question is too basic, but I wanted to know which
logs are the most important to check everyday for security purposes
(I'm using Linux Debian).
I check auth.log daily, and the accesses for some programs, but I read
some articles that say that there are logs that must be checked
regularly in the system in order to keep safe and identify possible
intrusions/activity in the network.

thanks

tahis