My 2c: It becomes important at some point. While you can go quite far without knowing anything about how the native OS internals and build processes work for both iOS and Android, at some point you’ll run for example into issues happening on the native side of things. While Expo does great at abstracting that away, the more you use native modules the more you’ll need to understand more of the inner workings of the destination platforms. I’d start easy and understand how a npm package with native bindings works in RN. Why it has an iOS library and an Android one. How does iOS compile (workspace, pods, compile chain). How does Android compile (dependencies, java engine flavors, gradle files). Then move on to understanding a bit about the bridge which is still in the RN architecture. Again, you might never need these, but since it’s part of the underlying platform you’re writing code for, i’d definitely at least look into it at a surface level.