I recently received a question in the comments on doing a tutorial for installing mods in Minetest. This video outlines the file structure and location for installing mods on Windows, Mac OSx, and Ubuntu Linux. I focused on Ubuntu because that is the Linux distro I use. There are instructions on the Minetest site outlining other Linux and BSD distros.
Operating system times in the video,
Mac OSx 12:47
Ubuntu Linux 21:09
I wish the video turned out better but I think I covered the basics of where the files are located and laid out in each operating system.
This video was also a failure fest. My development computer has two hard drives, Windows and a separate drive for two Linux distros. After six years the Linux drive failed. Luckily I have the important files backed up. I also have Ubuntu installed in Virtual Box on my Mac. I can install the full Ubuntu distro with updates in just under 30 minutes compared to Windows which may take several hours. I have reinstalled OSx in just under an hour with no issues.