Yesterday, I shipped my first Android app. I used the Vue.js based Quasar framework that has Cordova support for building hybrid mobile apps.
Biggest lesson: experiment with Cordova and platform specific tools before you're ready to use them. If I was trying to use Cordova for the first time on a more serious project it would have been much more discouraging when it didn't work.
The app itself is a counter of engagement and interactions with your online communities. It is based on Gary Vaynerchuk's $1.80 strategy and can be found on the Google Play Store.