Kotlin Fundamentals

Module 1: Kotlin basics and project setup

• Syntax tour variables, types, val vs var, type inference
• Functions, default and named arguments, extensions
• Packages, imports, source layout, Gradle basics
• Using the REPL and running simple programs

Module 2: Null safety and control flow

• Nullable types, safe calls, Elvis operator, require and check
• When expression, ranges, loops, destructuring
• Smart casts and sealed hierarchies for decision flow
• Error handling with Result and exceptions in context

Module 3: Collections and functional style

• Immutable vs mutable lists, sets, maps
• Transform, filter, group, zip, associate
• Sequences for large pipelines and laziness
• Data parsing and formatting with standard library helpers

Module 4: Classes and reuse

• Classes, data classes, objects, companion objects
• Interfaces, inheritance, delegation
• Operators, equality, copy and immutability choices
• Organizing code into modules and packages

Module 5: Coroutines in plain language

• Suspending functions and structured concurrency
• Scope, context, dispatcher, withContext, launch, async
• Flows for streams and backpressure basics
• Practical patterns cancellation, timeouts, retries

Module 6: IO and app structure

• Reading and writing files safely
• HTTP at a glance with a simple client
• Config, env, and secrets handling for small apps
• Gradle tasks, dependency management, and build profiles

Module 7: Testing and quality

• JUnit and Kotlin test styles
• Property based tests at a beginner level
• Test doubles and fixtures without friction
• Static analysis, formatting, and simple CI hooks

Module 8: Interoperability and next steps

• Calling Java from Kotlin and Kotlin from Java
• Using popular libraries safely with null annotations
• Intro to Kotlin Multiplatform and Android at a glance
• Personal roadmap and a compact checklist