React Native Advanced

iOS

• Create a development account with apple (this can take some time for verification so do it early — $99/year)
• Add app icons to your app (I typically use this tool to generate all necessary sizes)
• Add splash screens to your app (I typically use this tool to generate all necessary sizes)
• Create a new explicit app id on developer.apple.com (this gives you more flexibility in the future rather than using a wildcard)
• Select your explicit app id as the bundle identifier in Xcode
• Create development and production certificates for your app (Fastlane match can help with this)
• Create development and production provisioning profiles for your app (Fastlane match can help with this)
• Create app in iTunes Connect

Android

• Create Google Play Developer Account ($25)
• Add app icons to your app (I typically use this tool to generate all necessary sizes)
• Add splash screens to your app (I typically use this tool to generate all necessary sizes)
• Update the package name of your application
• Generate the Signed Production APK
• Create app in the Google Play Console