I am newbie in Slackware and as I've already discovered (and as I suposed before installation) , here's no GUI configuration tools. So could we gather here the most important cfg files and short description what's what
For example:

/etc/X11/XF86Config - XFree configuration file (maybe the most important file for GUI)
/dev/fstab - disk devices and it's file systems

I'm waiting for Yours replies

Hmmmm. I don't know. What do you want to do?

All the config files are in /etc

I don't know what your goal is. What are you trying to do?

Yeah. /etc and /home/you. That's where most everything is, and it depends on what you want.
fstab - filesystems
inittab - system initialization
groups, passwd, shadow - who's who
a whole truckload of networking files.
lilo.conf - bootloader
profile - bash config
DIR_COLORS, inputrc, termcap* - make sure I/O looks and works right. Heh.
/etc/rc.d - runlevels
/etc/X11 - where the GUI lives
and screenrc!

Nah, it's all important. 'cd /usr/man/man5; ls' and do a lot of 'man ./this-and-that'. Or pop up xman in a GUI and check out section 5. (Mostly 5, anyway - though not everything there is relevant and some things are elswhere.)

digiot's post is exactly something what I wanted to get.