Have you tried Ionic & Phonegap (or Capacitor). Uses Angular or React. Can connect to phone api's so you can use the sensors. MS Code is a great development environment and it uses Typescript. Can create store ready apps for Apple or Android. Best off it's free with lots of support...have a look. Most important is to ensure your local versions match the repos before downloading. Have had some agony on old tutorials that don't match my local dev environment.

As long as we install Asimov's 3 laws of Robotics we'll be OK (he says with DARPA looking over his shoulder...read what happens in "Little Lost Robot"). :)

Hi have a look at Free Code Camp. Gives a good all round course with each topic covered by a challenge..also has chat/forum/Facebook/Meetups/..all the help you can get. Totally open source(i.e javascript, npm, git, etc)