Greetings to you, mobile developer.
We keep the list of implemented versus non-implemented rules up to date. Take a look at the remaining rules for the Android plugin or the remaining rules for the iOS plugin. You don't have enough? Go and give a hand to the spotters team.
Code quality is very important in this complex project. Each plugin (Android, iOS) works differently and you have to learn their coding style. Take a look at the contributing file for the iOS plugin and the contributing file for the Android plugin.