Here a short list of the most important directories and what they house. / The 'root' directory; reference point for all directories. /bin Binaries which are absolutely essential to run Linux. /boot All the files required for booting Linux on a system. /dev All the devices have their corresponding files here. /etc All the configuration files for the various software are stored here. Don't play with this directory. /home All users will have their 'My Documents' under this directory. If your id is tomh, your 'My Documents' (called home-directory) is /home/tomh. /lib The libraries required by system-applications. (Just like DLLs in Windows.) /lost+found When a disk-check finds files which are damaged or which are not linked to any directory, they are recovered to this directory. Such damages are almost always due to incorrect shutdown. /misc Miscellaneous files! /mnt The directory where peripherals and other file-systems are mounted. /opt The directory where optional software are installed. /proc proc houses a pseudo-filesystem. Its contents really do not exist anywhere on the disk, and are made available only when you cd to this directory and look at some file. Don't worry about it, anyway. /root The home-directory for the super-user: root. /sbin The system-administration binaries exist here. /tmp The directory where temporary files are created and stored. /usr Everything related to users! /usr/bin /bin houses critical binaries, whereas /usr/bin stores other binaries: not so critical but required nevertheless. /usr/include The header-files required by programs for compilation. /usr/lib The libraries required by user-applications. /usr/local Files peculiar to this particular machine. /usr/sbin User-administration binaries. /usr/share Information that can be shared by most users. /usr/src The source-code for the Linux kernel. /usr/X11R6 Files needed by the X Window system. /var Files whose contents vary frequently are in this directory. /var/log The log-files of the system. /var/spool Directories for mail, news, printing and other queued work.