/usr/X11R6/lib/X11/doc/README — Briefly describes the XFree86 architecture and how to get additional information about the XFree86 project as a new user.

/usr/X11R6/lib/X11/doc/RELNOTES — For advanced users that want to read about the latest features available in XFree86.

man xorg.conf — Contains information about the xorg.conf configuration files, including the meaning and syntax for the different sections within the files.

man X.Org — The primary man page for X.Org Foundation information.

man Xorg — Describes the X11R6.8 display server.