I disagree. The post seems to me like it is aimed at learning new things, not an in-depth investigation on how the things you're already doing work in the backg

I disagree. The post seems to me like it is aimed at learning new things, not an in-depth investigation on how the things you're already doing work in the background. The things in the article are explained on their own level, and then a level below it, i.e. the file descriptors. How the file descriptors work, where they're stored, things like that, are well out of the scope of the article. IMO.