Kotlin
Compose

Jetpack (LiveData, Navigation, ViewModel, DataBinding / ViewBinding, CameraX, Paging, Hilt, WorkManager, Room...)
Firebase (Firestore, Remote Config, App Distribution, Dynamic Links, Authentication, Events...)
Network: Retrofit, OkHttp3, Moshi / Gson
Image Process: Coil / Glide / Picasso
Design: Material, Constraint Layout, Motion Layout, Lottie
Log: Timber, Pluto

Coroutines, Flow