of it.
/ "Root" Everything on the system.
/bin Essential binaries (Sometimes a link to /usr/bin).
/boot Boot loader files.
/dev Device files.
/etc System-wide configuration files.
/home Non-root user directories.
/home/your-user-name Your user directory.
/lib Essential libraries (Sometimes a link to /usr/lib).
/media Mount points for removable media (Alternatively, /run/media).
/mnt Temporarily mounted file systems.
/opt Optional application files (Standalone installers may use this).
/proc Process and kernel information files.
/root Home directory of the root user.
/run Run-time data since last boot.
/sbin Essential system binaries (Sometimes a link to /bin).
/srv Data served (vis á vis HTTP, FTP, etc.) by the system.
/sys Information about devices, drivers, and kernel features.
/tmp Temporary files. Your browser may cache web pages here.
/usr Read only user data: Applications and their libraries, mostly.
/usr/bin User application binaries.
/usr/lib User application libraries.
/usr/include Development headers.
/usr/share Non-instruction user application files.
/usr/local Third-party user applications data.
/var Files expected to change frequently, caches, logs, spools, etc