Hey Swebd, great question!
So, the reason I use innerWidth sometimes instead of window.innerWidth is that by default, you can access any window property within a JS file as long as it's being read by the browser.
You technically don't need window at all, as long as you know the property name associated with the window object, you can take out the window portion altogether.
The main reason you'd want to keep that window. prefix is for clarity purposes. In my case, I already know innerWidth and innerHeight are window properties, so I don't really include it in most of my projects unless I absolutely have to.
