They say that Linux is tweaker's heaven, here is why:
All of the configuration files are readable and quiet easy to understand, here is a list of the most common files and a short description what they are about. ( go on, do have a look with "cat" )
/etc/bashrc =settings for the bash shell trough the system
/etc/crontab =setting for the cron-jobs ( remember the jobs that run in the middle of the night ? )
/etc/cups =the printer settings ( if you use lpr instead of cups: /etc/printcap )
/etc/fstab = filesystem table
/etc/inittab = the default runlevel
/etc/lilo.conf = the configuration of the boot loader ( /boot/grub if you use grub instaed of lilo )
/etc/modules.conf = the modules to load at boot
/etc/profile = programs started at boot
/etc/rc.d = the different runlevels and shotcuts to programs to load at that level
/etc/ssh = the ssh settings for secure remote acces
/etc/X11/XF86Config = the X configuration ( GUI )
~/.bash_profile = aliases and variables for the bash shell
~/.bashrc = personal settings for the bash shell
~/.evolution = your mail, adresses and settings for evolution
~/.galeon = you bookmarks and settings for galeon
~/.gnome = your personal gnome settings
~/.gnome2 = more gnome settings
~/.kde = your peronal settings for kde
~/Mail = here are your mail and mail settings if you use kmail
~/.mozilla = personal mozilla settings, bookmarks etc.
~/.ssh = personal ssh settings
~/.exrc = your settings for the vi editor
