/bin - binary applications (most of your executable files) /boot - files required to boot (such as the kernel, etc) /dev - your devices (everything from drives to displays) /etc - just about every configuration file for your system /etc/profile.d - contains scripts that are run by /etc/profile upon login. /etc/X11 - configuration files for the X Window system /home - locally stored user files and folders /lib - system libraries (similar to Program Files) /media - mounted (or loaded) devices such as cdroms, digital cameras, etc. /mnt - mounted file systems /opt - location for “optionally” installed programs /proc - dynamic directory including information about and listing of processes /sys - contains information about the system /var - mainly logs, databases, etc. /usr/local/bin - the place to put your own programs. They will not be overwritten with upgrades. /usr/share/doc - documentation.