Basic Linux Commands Tutorial

/bin - binary files; /boot - information need to boot the system; /cdrom - your CD-ROM drive; (/dos) - your DOS partition; /dev - device drivers; /etc - miscellaneous files (mostly system administration); /home - home directories for users; /lib - programming libraries; /tmp - temporary files; /usr - commands; /var - files that define the system.

I've known some of them but not all, interesting stuff though.