TL;DR Make a note of only what you want to remember. Make notes in order of deepest involvement.
/bin Basic commands used by both system administrators (root) and general users / sbin is the command used by the system administrator (root)
/etc setting file System configuration file, application configuration file
/tmp Temporarily save the file Rebooting will delete the files in the directory
/var Temporarily save the file Rebooting does not delete files in the directory Log files etc. are placed
/usr A directory for users with many subdirectories / usr / bin Commands commonly used by users / usr / lib Shared libraries required for programs / usr / local Commands and libraries required by the local system
/mnt Removable media
/lib The libraries needed to execute commands in the "/ bin" and "/ sbin" directories
/home Each user's home directory
/boot Files required at system startup
/dev Device file
/opt Used when installing with dpkg
/proc Information inside the kernel CPU, memory usage, network information, etc.
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