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Roadmap:

Topics by level, from the basics to the advanced. Many of them suggest what to study next.

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Tier 1 · Beginner

12 topics

Android ArchitectureNext: Boxing & Equality3subtopics10questions
Kotlin FundamentalsNext: Null Safety, Collections & Sequences8subtopics12questions
Boxing & EqualityNext: Concurrency4subtopics4questions
Null SafetyNext: Classes & Properties6subtopics7questions
Collections & SequencesNext: Inline Functions, Functions & Lambdas6subtopics9questions
ConcurrencyNext: Custom Views8subtopics6questions
Classes & PropertiesNext: Sealed Hierarchies & Objects7subtopics8questions
Custom ViewsNext: Data Classes4subtopics3questions
Data ClassesNext: Delegation2subtopics8questions
DelegationNext: Dependency Injection1subtopic4questions
Dependency InjectionNext: Generics3subtopics4questions
Generics2subtopics7questions

Tier 2 · Intermediate

4 topics

Sealed Hierarchies & Objects5subtopics9questions
Inline Functions3subtopics5questions
Functions & LambdasNext: Coroutines8subtopics13questions
CoroutinesNext: Coroutine Cancellation & Failure7subtopics21questions

Tier 3 · Advanced

4 topics

Kotlin Multiplatform8subtopics18questions
Build & Compiler7subtopics11questions
Coroutine Cancellation & FailureNext: Flow & Channels5subtopics9questions
Flow & Channels8subtopics11questions

Kotlin — Roadmap — IT Abyss