If I want to build Andorid app today, what are my options?
1. Java/Kotlin - which I don't know
2. c# and Xamarin - same as with Java
3. ReactNative (JS)
5. what else?
Funny thing out of does three mentioned. I know JS and a bit of React and is the easiest solution to create not only mobile but a desktop app to. And, kids, that is how you get gazillion electron apps.