Which language to learn if you want to developed a web base mobile app like sololearn

Question

Which languages is necessary for web base app

Answer 1

You need to learn Java or Kotlin and use Android Studio, which will eat your RAM faster than Chrome. Then you need to learn the base of android sdk, which is a little bit complex. The biggest part of widgets (menu by dragging from left side or circular context buttons from right down etc.) are preinstalled. Have a good time learning!!!

Answer 2

You can also use React Native.