The Filesystem Hierarchy Standard describes a lot of how Linux filesystem is laid out. Wikipedia has an OK intro https://en.m.wikipedia.org/wiki/Filesystem_Hier

The Filesystem Hierarchy Standard describes a lot of how Linux filesystem is laid out. Wikipedia has an OK intro https://en.m.wikipedia.org/wiki/Filesystem_Hierarchy_Standard https://en.m.wikipedia.org/wiki/Filesystem_Hierarchy_Standar... For user applications the XDG Base Directory specification is also useful https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html https://specifications.freedesktop.org/basedir-spec/basedir-...