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Foundations of the Kotlin language: the type system, OOP pillars, idiomatic patterns, memory model, and the standard collections library.

Chapters

#	Chapter	Topics
1	Kotlin Foundations	Algorithms, compilation, data types, variables, operators, control flow
2	OOP Foundations	Encapsulation, inheritance, polymorphism, abstraction, dependency inversion
3	Idiomatic Kotlin	data/sealed/enum classes, scope functions, extensions, generics, variance
4	Memory & Hashing	Stack vs heap, object references, HashMap internals, equals/hashCode
5	Garbage Collection	JVM GC, reference types, memory leaks, Android considerations
6	Kotlin Collections	List/Set/Map, arrays, sequences, lazy evaluation, common operations

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Table of contents

• Kotlin Foundations
• OOP Foundations
• Idiomatic Kotlin
• Memory & Hashing Fundamentals
• Garbage Collection
• Kotlin Collections