Welcome to our exploration of Compound Data Structures in Kotlin. Having navigated through Maps, Sets, and Lists, we'll delve into nested maps and lists. These structures enable us to handle complex and hierarchical data, which is typical in real-world scenarios. This lesson will guide you through a recap of the basics, the creation and modification of nested maps and lists, as well as common error handling.

Here's a simple example of a school directory that uses a map with grades as keys and lists of students as values:

Just like their non-nested versions, creating nested structures is straightforward. Kotlin's data classes can be leveraged for better organization when needed.

Nested Map: