When you get started using React Native, the upside is that there are many community tools and material on the internet. The downside is also that there are so many community tools and material on the internet, that you can easily get lost.
It can be hard to find tools to debug or profile how the app is working. Community UI components can come in varying degrees of quality. Some components work but are not up-to-date with the framework. Browsing through tools on the internet can take time and not end up fixing the issue at hand.
This short guide will highlight some essential tools that should be the first recourse for developers beginning to use React Native.
React Native docs and GitHub issues: the official documentation is the number one resource to start with, but also the GitHub repository is useful to read release notes (and there are quite often new releases). It is also useful to search through the issues and see if your issue has already been experienced by other people.
React docs: when building React Native apps, you'll be writing React components and it's useful to refer to its official documentation sometimes to learn to properly use lifecycle hooks, performance optimization, and when modeling your application through props and state.
Expo: although it's not an official RN tool, Expo is probably the quickest way to get started when building a React Native app, so it's ideal for the initial stages of a project or when collaborating with a designer. It's handy to keep the Android Expo app or iOS Expo app installed on your phone, as well as use Expo Snack (code an app in the browser!) for quick experimentations.
React Native Navigation: the topic of navigation (managing the state and transitions between screens in your app) has been sometimes officially supported in the framework, but it has had better solutions in the community as well. Nowadays the framework still has some navigation-related components, but the wise choice is to use either React Navigation or React Native Navigation (RNN). If you can afford the time to propely setup RNN by following its documentation, it will turn out to be the best navigation solution you can find out there, with good API, platform look and feel, and responsive performance.
JS.coach: there are so many community components for React Native, that it becomes useful to have a curated list of components, with an easy way of detecting whether they support Android or iOS or both. JS.coach is such list, with a search field and sub-categories in React Native.
Awesome React Native: an alternative curated list is awesome-react-native which includes components, but also native modules, utilities, example open source projects, blog posts, conferences, etc. Search here before searching on the wild web.
Debugging and profiling
react-native log-ios or
react-native log-android can help. For Android, you can run just
adb logcat and it will show logs on everything happening in the device, not only in your app. Read more about debugging tools in the docs.
React Devtools: you can inspect the hierarchy of UI components with React Devtools which works for both React (web) and React Native.
systrace: for profiling performance in Android applications, systrace is a tool (in the Android SDK) not so familiar to many developers, but essential. It has a rather inconvenient way of using, but once you gather profiling data, it shows a lot of important important that helps you improve the performance of your app. Read more about React Native profiling in the docs.
Conference videos: React Native is a constantly evolving framework, and some of its internals are still not documented, so sometimes React Native conference videos (from e.g. React Native EU, ReactiveConf, Chain React) on YouTube can help gaining insight.
Egghead courses: sometimes you may want a video course where another developer guides you step-by-step in creating a real world app, so Egghead has a couple of these courses. Some of them are specific to topic, for instance, animations. You may find free videos also on YouTube, of various quality levels.
People to follow: some people in the community are influential and often send out news about the framework. Eric Vicenti is a React Native core team member at Facebook. Brent Vatne is the main developer for Expo, and overall is involved with React Native. Leland Richardson works at Airbnb with large React Native projects, and authors some libraries. Mike Grabowski is a member of React Native core team and runs a company specialized in React Native, as well as running React Native EU conferences. Emil Sjölander works on the native side (C) of React Native, Yoga. Martin Konicek previously worked on React Native internals, e.g. the bridge and often still shares some knowledge about React Native.
That should cover most of what you need to know when developing mobile apps with this framework!