If you know JS and React, learning RN could let you start doing mobile development right away. That's a powerful thing since you don't need to learn a new language and/or framework.
Note even if you use RN you may need Swift/Kotlin/Java/Objective-C when you need some native feature which is not available on RN yet, however RN will still simplify you a lot of work letting you re-use your knowledge on how to build user interfaces.
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