I could kill for a Kotlin printed book without missing sections about:
1. Co-Routines
2. Jetpack Compose.

That is less than 3 years old.

Unfortunately the decent ones I'm asking seem to be produced by oysters.

In the meantime I've learnt all the basic variables types, also val and var, some books forget there's a "const val" in Kotlin. I know what oddity is the "Elvis operator"....which seems rather silly when they could have used one "or" as in

this = that || defaultValue

Also that Kotlin is pretty much aiming at being Java but more FP than usual, which is ideal when you're coding most of the time in Elixir and hate Java.