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Linux Directory Structure - FHS
(lemm.ee)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
usr does mean user. It was the place for user managed stuff originally. The home directory used to be a sub directory of the usr directory.
The meaning and purpose of unix directories has very organically evolved. Heck, it's still evolving. For example, the new .config directory in the home directory.
Per the graphic, it means Unix System Resources....
I don't trust a graphic which explains /boot as "system boot loader files"...
It kind of makes sense on many BIOS/UEFI-less systems where e.g. Uboot is used. And it does contain things like kernel images, sometimes initRD files etc. (which may not be bootloader files but are still system boot files).