Kotlin Roadmap for Freshers
A comprehensive 8-week learning plan to master Kotlin programming from scratch
This roadmap assumes 3-4 hours of daily study (2 hours learning + 1-2 hours practice)
Goal
This roadmap sequences topics so each day builds on the last—skip ahead only after exercises feel easy.
Method
Block time for practice: reading without coding rarely sticks for technical skills.
Week 1: Kotlin Fundamentals & Setup
| Day | Topics | Learn (hrs) | Practice (hrs) | Important Topics |
|---|---|---|---|---|
| Week 1: Kotlin Basics | ||||
| Day 1 |
Kotlin Introduction - History & Features - JDK & IDE Setup - Hello World Program |
2 | 1 | JVM, Null Safety, Interoperability |
| Day 2 |
Kotlin Basics - Variables & Data Types - Type Inference - Null Safety |
2 | 1.5 | val vs var, Nullable Types |
| Day 3 |
Operators & Control Flow - Arithmetic, Logical - Conditional Expressions - if-else, when expression |
1.5 | 1.5 | Elvis Operator, Smart Casts |
| Day 4 |
Loops & Functions - for, while, do-while - Function Declaration - Default & Named Arguments |
2 | 2 | Extension Functions, Infix Notation |
| Day 5 |
Collections & OOP Basics - Lists, Sets, Maps - Classes & Objects - Constructors |
2 | 2 | Data Classes, Primary/Secondary Constructors |
| Day 6 |
Practice Day - Mini Kotlin Projects - Problem Solving |
1 | 3 | Calculator, Number Guessing Game |
| Day 7 |
Review Day - Week 1 Concepts - Q&A Session |
1 | 2 | Common Mistakes, Debugging |
Week 2: Object-Oriented Programming & Functional Features
| Day | Topics | Learn (hrs) | Practice (hrs) | Important Topics |
|---|---|---|---|---|
| Week 2: Advanced OOP | ||||
| Day 8 |
Inheritance & Interfaces - Open Classes - Interface Implementation - Abstract Classes |
2 | 1.5 | By Delegation, Overriding Rules |
| Day 9 |
Visibility Modifiers - public, private, protected - internal modifier - Sealed Classes |
2 | 2 | Module Concept, Sealed Class Benefits |
| Day 10 |
Kotlin Specific Features - Data Classes - Object Declarations - Companion Objects |
2.5 | 2 | Singleton Pattern, Utility Functions |
| Day 11 |
Functional Programming - Lambda Expressions - Higher-Order Functions - Collection Operations |
2 | 2 | it keyword, Function Types |
| Day 12 |
Scope Functions - let, run, with - apply, also - Proper Usage |
2.5 | 2 | Context Object, Return Values |
| Day 13 |
Practice Day - OOP Challenges - Functional Exercises |
1 | 3 | Bank Account System, Collection Processing |
| Day 14 |
Review Day - Week 2 Concepts - Q&A Session |
1 | 2 | Common Functional Patterns |
Week 3-4: Advanced Kotlin & Coroutines
| Day | Topics | Learn (hrs) | Practice (hrs) | Important Topics |
|---|---|---|---|---|
| Week 3: Advanced Features | ||||
| Day 15 |
Exception Handling - try-catch-finally - Custom Exceptions - Checked vs Unchecked |
2.5 | 2 | Kotlin's Approach to Checked Exceptions |
| Day 16 |
Generics - Generic Functions - Generic Classes - Variance (in/out) |
2 | 2 | Type Projection, Star Projection |
| Day 17 |
Delegated Properties - lazy, observable - vetoable, notNull - Custom Delegates |
2 | 2 | Property Delegation Pattern |
| Day 18 |
DSLs & Type-Safe Builders - DSL Concepts - Builder Pattern - Creating Simple DSLs |
2 | 2 | Receiver Functions, Lambda with Receiver |
| Day 19 |
Coroutines Introduction - Async Programming - suspend functions - Coroutine Builders |
2 | 2 | Structured Concurrency |
| Day 20 |
Practice Day - Advanced Features - Coroutine Basics |
1 | 3 | Custom DSL, Simple Coroutine App |
| Day 21 |
Review Day - Week 3 Concepts - Q&A Session |
1 | 2 | Coroutine Use Cases |
| Week 4: Coroutines Deep Dive | ||||
| Day 22 |
Coroutine Context & Dispatchers - Dispatchers.IO, Main, Default - withContext - Job & CoroutineScope |
2.5 | 2 | Context Switching, Proper Dispatcher Usage |
| Day 23 |
Async/Await & Flow - async builder - Deferred values - Flow Basics |
2 | 2 | Exception Handling in Async |
| Day 24 |
Flow Operations - Operators (map, filter) - Terminal Operators - Exception Handling |
2.5 | 2 | Cold vs Hot Streams |
| Day 25 |
Channels & SharedFlow - Channel Basics - Producer-Consumer Pattern - StateFlow & SharedFlow |
2 | 2 | Broadcasting Values |
| Day 26 |
Testing Coroutines - TestCoroutineDispatcher - runBlockingTest - Testing Flows |
2 | 2 | Virtual Time, Testing Strategies |
| Day 27 |
Practice Day - Coroutine Projects - Flow Applications |
1 | 3 | API Client with Coroutines |
| Day 28 |
Review Day - Week 4 Concepts - Q&A Session |
1 | 2 | Coroutine Best Practices |
Week 5-8: Application Development & Advanced Topics
| Day | Topics | Learn (hrs) | Practice (hrs) | Important Topics |
|---|---|---|---|---|
| Week 5: Android Development with Kotlin | ||||
| Day 29 |
Android Setup & Basics - Android Studio Setup - Project Structure - Basic UI Components |
2.5 | 2 | View vs ViewGroup, Layouts |
| Day 30 |
Activity & Fragment Lifecycle - Lifecycle Methods - Configuration Changes - ViewModel Introduction |
2.5 | 2 | State Preservation, Lifecycle Awareness |
| Day 31 |
Android Architecture Components - ViewModel - LiveData - Data Binding |
3 | 2 | Observer Pattern, Data Binding Benefits |
| Day 32 |
Networking with Retrofit - Retrofit Setup - REST API Integration - Coroutines with Retrofit |
2.5 | 2 | Interceptor, Error Handling |
| Day 33 |
Room Database - Entity Definition - DAO Interface - Database Setup |
2 | 2 | Migrations, Type Converters |
| Day 34 |
Practice Day - Complete Android App - API + Database Integration |
1 | 3 | Note-taking App |
| Day 35 |
Review Day - Week 5 Concepts - Q&A Session |
1 | 2 | MVVM Architecture |
| Week 6: Backend Development with Ktor | ||||
| Day 36 |
Ktor Introduction - Ktor Setup - Routing Basics - Plugins & Features |
2.5 | 2 | Application & Routing Plugin |
| Day 37 |
Advanced Routing - Path Parameters - Query Parameters - Grouping Routes |
2.5 | 2 | Nested Routing, Route Organization |
| Day 38 |
Database Integration - Exposed Framework - CRUD Operations - Connection Pooling |
2 | 2 | DSL vs DAO Approach |
| Day 39 |
Authentication & Authorization - JWT Authentication - Hashing Passwords - Role-based Access |
2.5 | 2 | Security Best Practices |
| Day 40 |
Practice Day - Complete Ktor API - Authentication System |
1 | 3 | User Management API |
| Day 41-42 |
Review & Projects - Week 6 Concepts - Mini Projects |
1 | 4 | API Documentation |
| Week 7-8: Advanced Topics & Projects | ||||
| Day 43-49 |
Advanced Topics - Multiplatform Development - Dependency Injection (Koin) - Gradle Kotlin DSL |
3 | 3 | Sharing Code between Platforms |
| Day 50-56 |
Final Projects - Complete Android App - Full-stack Application - Open Source Contribution |
2 | 4 | Portfolio Development |
| Day 57-60 |
Review & Deployment - App Publishing - Code Optimization - Portfolio Preparation |
2 | 3 | Play Store Deployment, Backend Hosting |
Key Recommendations
- Daily Practice: Code every day to build muscle memory
- Projects: Create at least 3 complete apps by the end
- Documentation: Learn to read Kotlin and Android documentation
- Community: Join Kotlin communities and participate in discussions
- Challenges: Solve problems on platforms like LeetCode and HackerRank
Comprehensive Kotlin Learning Path
This Kotlin roadmap on Nikhil Learn Hub provides a structured learning path: Learn Kotlin syntax, Android development, OOP concepts, coroutines, and modern mobile app programming techniques.
Use the schedule, weekly tables, and practice notes on this page to pace your progress. Keep the Android development cheatsheet open for syntax and API reminders during exercises.
Foundation phase
- Core concepts and terminology for this stack
- Guided exercises and small coding drills
- Hands-on labs aligned with each milestone
- Review checkpoints before moving forward
Advanced phase
- Multi-topic projects and integration tasks
- Performance, security, or scalability basics
- Tooling and workflow patterns used in industry
- Interview, certification, or portfolio preparation
Who Should Follow This Roadmap
Students, career switchers, and developers upskilling in Kotlin can follow this roadmap for credible study order instead of scattered tutorials.
Related Resources on Nikhil Learn Hub
- Android development cheatsheetquick reference while you follow this roadmap
- Technology roadmaps hubbrowse all structured learning paths
- Technology hubbroader programming and AI resources