Introduce the best source for learning android programing (It's better based on kotlin)

Question

Please say seperately if you know for each one of kotlin or java or flutter

Answer 1

Udacity

Answer 2

I think nowadays the Kotlin and Flutter are trending issue...
You'll find best courses for each of them on that mentioned site!

Answer 3

alireza yeah it's free

Answer 4

Sabiry 🇦🇫 Is it free?I can't find the free course in udacity