I have no experience in Frontend development and I am trying to figure out what to try first. In my research I found that there is apparently a difference between React and React Native (cf. What is the difference between React Native and React?). But given that React Native seems to have a superset of the capabilities of React (i.e. also able to create websites with the additional mobile capability), it seems like there is no reason to ever use React. Which is probably false. I mean it is not like React is deprecated or something, right?

So what are the advantages of React over React Native? Is it somehow more efficient for web development? Given that both seem to generate pure html/css/js ("compile") instead of being used directly, this feels like it should be wrong.