When you started to use React Native, sometimes you can see your disk increase a lot, perhaps cache NPM, or simulators cache, mainly if you use a Mac with a limited disk, like me.
Clear NPM cache
npm cache clean --force
Clear Yarn cache
yarn cache clean
Clear the iOS build
To clean the iOS build press Option+Shift+Command+K or go to Xcode menu Product -> Clean Build Folder. This will only clean cache for your current target.
Reset iOS Simulator and erase data
To reset the iOS simulator and erase all simulator data go to menu and Hardware -> Erase All Content and Settings
Reset Android Simulator and erase data
Open Android Studio then goes to menu Tools -> AVD Manager. Then select the menu in your selected simulator and click on wipe data.
Clear Android Build Cache
Go to root directly of your react native project and run following commands:
cd android && ./gradlew cleanBuildCache