You can get information about applications and process using the ActivityManager class. I don't know of any way to directly monitor app launches.. But you could repeatedly check the running apps list and find out what apps were launched recently. check that link https://stackoverflow.com/q/3304685

If there weren't any issues I would probably be unemployed.

That's the KDE version which is probably even heavier than the default Gnome one. Either Xubuntu (xfce) or Lubuntu(lxde) are lighter versions of Ubuntu which is really beginner friendly.

If it is performance and flexibility wise, Native will always ( maybe not always ), outscore hybrids or wrappers like RN , think about the native language as low level programming. It takes more work but you're​ able to be as presice and detailed as you want. It's unlimited . ( apart from platform limits ofcurse )

Thief, for sure

Thanks for your answer! I just think spending my time on CSS to be responsive and cross browser might be a waste of precious time I can write the app's logic in..

Seems like its a bit out of the scope for developers.. At least for me ( even by fb cover is from 5 years ago lol)