How to do challanges for bits

Question

basically the title, I couldn't find where to do those challanges for extra bits

Answer 1

Community -> practice -> code challenge

Answer 2

I believe this is one of the things that are only available in the app.

Answer 3

Coookiee
This feature is not available on website but don't worry you can still use this app on computer using Emulator software.

Answer 4

not on phone but on website