Ubuntu has turned into the Mac of the Linux world. Users are stereotyped as the hipsters and stuff. I used Ubuntu at first, but after realising that it was burning up my CPU all the time, I had to switch flavours.
What is a file in Linux? What is file system in Linux? Where are all the configuration files? Where do I keep my downloaded applications? Is there really a filesystem standard structure in Linux? Well, the above image explains Linux file system hierarchy in a very simple and non-complex way. It's very useful when you're looking for a configuration file or a binary file. I've added some explanation and examples below, but that's TLDR.