When it comes to media types, whats the difference between @media (min-width:) and @media 👉🏻 screen only (min-width:)?

It means the styles within will apply only to media type screen. Other media types are: print, all, and speech. Media type, all, is the default if no other type is given.

As for why declare as type screen, is that you may only want to apply the styles to screens (e.g. computer, tablet, phone screen), and not to all media types.