The App API handles high level App state and events.For example, this API emits events when the app enters and leaves the foreground, handles deeplinks, opens other apps, and manages persisted plugin state.
The Geolocation API provides simple methods for getting and tracking the current position of the device using GPS, along with altitude, heading, and speed information if available.
Material UI is an open-source React component library that implements Google's Material Design. It's comprehensive and can be used in production out of the box.