Classes-Kotlin-Documentation

https://kotlinlang.org/docs/reference/classes.html



Properties-Kotlin-Documentation

https://kotlinlang.org/docs/reference/properties.html



Properties-and-Setters-and-Getters-in-Kotlin

https://kotlinlang.org/docs/reference/properties.html



Data-Classes-Documentation

https://kotlinlang.org/docs/reference/data-classes.html



Inheritance-Documentation

https://kotlinlang.org/docs/reference/classes.html



Interfaces-Documentation

https://kotlinlang.org/docs/reference/interfaces.html



Why-interfaces-in-Kotlin-are-super-powerful-and-better-than-in-Java

https://proandroiddev.com/kotlin-made-interface-so-much-better-bbeaa59abdd7



Abstract-Classes-Documentation

https://kotlinlang.org/docs/reference/classes.html#abstract-classes



Typecasting-Collections-Documentation

https://kotlinlang.org/docs/tutorials/kotlin-for-py/collections.html