That’s why I linked to the source of all truth in the tutorial I gave your previously and although you didn’t post a link to the video some random moron dude or dudette made, I can tell you he’s full of ■■■■ he’s incorrect… 
The linked document is the official File System Hierarchy Standard created by the Linux Foundation itself that the creators of Manjaro, Ubuntu; RHEL, … use to create their distros.
I.E. This guy:
I rest my case, your honour!
