Just in case, I have to share this great explanation of the term "everything is a file": https://unix.stackexchange.com/questions/141016/a-laymans-explanation-for-everything-is-a-file-what-differs-from-windows#141020
This really helped clear things up for me, the main idea is that everything is represented by the filesystem, so you can use the same file-manipulation tools on a ton of systems.
Just in case, I have to share this great explanation of the term "everything is a file": https://unix.stackexchange.com/questions/141016/a-laymans-explanation-for-everything-is-a-file-what-differs-from-windows#141020
This really helped clear things up for me, the main idea is that everything is represented by the filesystem, so you can use the same file-manipulation tools on a ton of systems.