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-vim-33683yAfter you learn the basics of js, you could switch to Kotlin if that’s what you were using for android, as it can be used as a js-compilable programming language
If you decide to go down the route of RN, I'd suggest going through ReactJS and how it works first then go back to RN.
After you understan those 2, you'd need some sort of state management, I'd suggest Redux, it's basically like a singelton which contains all the states of your app.
If you've reached this point (which shouldn't take long), then you could see if you still like to continue using RN, and would need to look into navigation libraries etc
Also there is kotlin native, but I think it's in early stages. I believe it would be similar to writing a shared lib (as you'd do in c) and use it accross different platforms.