I have completed kotlin course from online, guys can you tell me platform where I can do challenges?

Question

Like Website, app, etc. You can also guide me what should I do now.

Answer 1

Run this code made by John Wells and also I recommend to follow him. You can follow the links in the code, each one points to a topic about Kotlin with explanation and examples.
https://code.sololearn.com/WVLwHz62yi3c/?ref=app

I also recommend to do the official Kotlin koans, these are little challenge questions that teach about language features. If you are stuck, always check the documentation / official tutorials.
https://play.kotlinlang.org/koans

You can use the SoloLearn playground to write Kotlin codes too, and if you want more challenges there are sites like https://www.codewars.com/ where you can practice Kotlin.

Answer 2

Sololearn

Answer 3

You have to install android studio and to start android developpement.