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React Native Gesture Handler (included with Expo) is one of my favorite because it meaningfully advances the way we can compose gestures, and does so in an incremental way that lets developers migrate pieces of their app to use the new gesture system. Advancing the state of the art in a good way and heavily investing in migration paths are two great things about this library.
I also like Redux, though it's not specific to RN nor React. Redux's approach of using reducers as a chokepoint to atomically recompute state lends itself to correctness and consistency. And I find it relates to several introductory concepts covered in "Structure and Interpretation of Computer Programs" (mitpress.mit.edu/sicp/full-text/book/book.html), which is a great book for learning foundational computer science.
plenty more that I haven't listed here!