What are Android's main uses for background work and threading?

Question

Android

Android has a lot of classes for background work and work with threads, many of them seem to be outdated, for example AsyncTask, Loaders. What are the most commonly used classes for background work?
In Kotlin, it seems to be mostly Coroutines, right? And in Java? What exactly is worth knowing about background work and threads in Android?

Answer 1

To work with threads, one usually chooses between RxJava and Coroutines, the rest can be forgotten. And if you mean background work in Android , then this is Service