standard_directories

Path	Contents
/bin	Binaries(executables) which are essential to the system, e.g. for shells(bash) and commands(cp,mv,ls)
/dev	Links to hardware devices managed by the kernel
/etc	Configuration files
/home	User Home directories
/proc	View of the current state of the kernel and running processes as files
/sbin	like /bin but contains programs for use by system administrators instead
/tmp	Temporary files, often deleted during reboot
/usr	Most non-essential Applications, header files,Libraries and other read-only data
/var	Variables files, caches, log files print spoolers, etc.