UNIX Filesystem

/bin   -   User Binaries 
/sbin  -   System Binaries
/etc   -   Config Files
/dev   -   Devive Files
/proc  -   Process Files
/var   -   Variable Files
/tmp   -   Temporary Files
/usr   -   User Programs
/home  -   Home Directory
/boot  -   Boot Files
/lib   -   Systems Libraries
/opt   -   Optional App
/mnt   -   Mount Directory
/media -   Removable Media
/srv   -   Service Data