a) / bin directory: store commonly used Linux commands corresponding binary
b) / boot directory: boot loader to use when a Linux system
c) / dev directory: an external storage device corresponding to the Linux file system
d) / etc directory: to store configuration files
e) / home directory: the average user's home directory
f) / opt directory: Extract directory store when installing some applications. For example: JDK, Tomcat will directly extract to this directory
g) / root directory: The administrator's home directory
h) / tmp directory: temporary files
i) / usr directory: By "Performing Setup" to install third-party applications are usually installed to / usr directory