Android — resources

roadmap.sh: https://roadmap.sh/android

Books

Kotlin in Action (Jemerov & Isakova) — the canonical deep dive into the Kotlin language from its designers.
Head First Android Development (Griffiths & Griffiths) — approachable, project-driven intro to the Android framework.
Jetpack Compose by Tutorials (raywenderlich/Kodeco) — hands-on path through modern declarative Android UI.
Android Programming: The Big Nerd Ranch Guide (Phillips et al.) — thorough, widely-used reference for core Android.

Android Developers — official docs — first-party guides, codelabs, and the Android Basics path.
Jetpack Compose docs & pathways — official Compose tutorials and samples.
Kotlin documentation — official language reference and koans for practice.
Now in Android (GitHub sample) — Google’s reference app showcasing modern architecture and Compose.