[dakna]

I recommend working through the beginner and advanced programming for Android tutorials on Udacity, both are free:

https://www.udacity.com/course/developing-android-apps-with-...

https://www.udacity.com/course/advanced-android-with-kotlin-...

That gives you a solid start to look into more details and do some codelabs on

https://codelabs.developers.google.com/?cat=Android

or watch a series about a certain topic on Youtube. I really like the Coding In Flow channel:

https://www.youtube.com/channel/UC_Fh8kvtkVPkeihBs42jGcA

[GFischer]

That's a good idea. I did the University of Maryland Coursera course and I liked it a lot:

https://www.coursera.org/learn/android-programming