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Regarding the CSS nav comment "/* nav background on mobile devices */"- why is it only for mobile devices?
It clearly works on non-mobile devices, so this is confusing. Can you explain?
The lesson is how to comment. You usually want different CSS for mobile, tablets, and desktops so you can improve mobile performance and look. The CSS will work on larger devices, but will not look as good because it will be formatted for a small screen. The comment is there to help remind you that the small screen formatting is there.
But soon you will have the base for small screens and add for larger. It is called mobile first design.