Android
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Things to understand:

- Familiarize Android Studio IDE
- The application's entrypoint is described in `AndroidManifest.xml` 
- Understand the Activity/Fragment lifecycles
- Pass data between two fragments
- Use the camera using `Intent` & retrieve its result
- Familiarize the parts of `build.gradle`
- Famialize `CMakeLists.txt`
- Use the `adb shell` 
- Create and return a `Pair` object from `C++` 
- Create a `C++` thread that periodically calls into a `Java` method
- Use `firebase` or `couchbase` stuff to see the bigger picture of `API` flow