Best way to learn writing software is to read open source code — Every Senior Programmer.
Reading open source code is the best and effective way to teach yourself to write better code, especially if the tool is fairly new or the standards around that tool are still evolving. ReactNative is a perfect candidate for such a tool. It is under constant iteration cycle with APIs evolving with every release, Massive pool of libraries to chose from and a very limited list of resources on how to move beyond getting started guides. Even otherwise, It is always a best practice to read open source code every now and then.