Tutorials

Free AI and technology tutorials, organised by subject so you always know what to learn next.

• 1. Android Unit Testing — Fundamentals — Android Unit Testing — Fundamentals
• 1. Testing Fundamentals and Strategy — Learn Android testing fundamentals from basic to interview level: software testing, manual vs automated testing, AAA test structure, test boundaries, testing pyramid, unit/integration/UI/E2E testing,…
• 2. Unit Testing with JUnit and Test Doubles — Learn Android unit testing from beginner to interview level using JUnit, local JVM tests, assertions, lifecycle annotations, parameterized tests, fakes, stubs, mocks, spies, MockK/Mockito, dependency…
• 4. Coroutine and Asynchronous Testing — Learn how to test Kotlin coroutines in Android using kotlinx-coroutines-test, runTest, test dispatchers, virtual time, coroutine scheduling, cancellation, timeouts, retries, exponential backoff, debo…
• 4. UI Testing with Espresso (Instrumented Tests) — 4. UI Testing with Espresso (Instrumented Tests)
• 6. Integration, Repository and Room Database Testing — Learn Android integration testing from beginner to interview level: test boundaries, repository strategies, fake and real data sources, cache-first and network-first behaviour, offline support, synch…
• 7. Retrofit API and Contract Testing — Learn how to test Retrofit APIs using MockWebServer: fake HTTP responses, request paths, headers, JSON bodies, successful and error responses, malformed JSON, timeouts, schemas, consumer/provider con…
• 8. Robolectric, ActivityScenario and Espresso — Beginner-to-advanced notes on local and instrumented Android tests, Robolectric, ActivityScenario, FragmentScenario, Espresso, RecyclerView testing, lifecycle testing, synchronization and custom Idli…
• 9. Jetpack Compose UI Testing — Learn Jetpack Compose testing from beginner to interview level: Compose test rules, semantics tree, node finders, matchers, actions, assertions, lazy-list testing, navigation, animations, mixed View/…
• Activity Lifecycle and Resource Management — Activity Lifecycle and Resource Management
• AIDL & Inter-Process Communication (IPC) — AIDL & Inter-Process Communication (IPC)Android study notes — concepts, diagrams, code, and interview preparation.
• Application Process — Application Process
• Android Deep Linking — explain it from Android developer point of view: concept first, then manifest setup, flow, App Links, testing, and common interview points.
• Android Interview Topics — Launch Modes1️⃣ standard (Default)Rule: Always creates a new instanceBack Stack A → A → AUse CaseProduct detailsFormsList → Detail screensInterview Line: Default mode, no reuse,...
• Android Keystore — Android Keystore
• Android Offline Support — Topics covered * Cache strategy * Stale-data indication * Synchronization * Conflict resolution * Source of truth
• Android Runtime: ART & Execution Model — Android Runtime: ART & Execution Model
• Android Testing and Gradle — Android Testing and Gradle
• Android View System Internals — Android View System Internals
• App Restart, State Restoration and Global Initialization — App Restart, State Restoration and Global Initialization
• Application Class — Application Class
• Background/ Started Service — Background/ Started Service
• Banking Android Application — Banking Android Application
• Bluetooth Classic + BLE — Bluetooth Classic + BLE
• Bound Service — Bound Service
• Clean Architecture — Clean Architecture in Android — Student Friendly Tutorial
• Comparison in Services — comparison
• Complete Kotlin Tutorial — Complete Kotlin Tutorial
• Compose Accessibility, Theming, Architecture and Testing — Compose Accessibility, Theming, Architecture and Testing
• Compose Lazy Layouts, Lists, Modifiers and Measurement — Compose Lazy Layouts, Lists, Modifiers and Measurement
• Compose Navigation, Interoperability, Animations and Gestures — Compose Navigation, Interoperability, Animations and Gestures
• Compose Side Effects, Lifecycle and Performance — Compose Side Effects, Lifecycle and Performance
• Configuration Changes, State Saving and Process Death — Configuration Changes, State Saving and Process Death
• Coroutine, Flow and LiveData — Coroutine, Flow and LiveData — Android Student-Friendly Tutorial
• Declarative UI, Composition, Recomposition and State — Declarative UI, Composition, Recomposition and State
• Deep Links, Navigation Component and Advanced Task Behaviour — Deep Links, Navigation Component and Advanced Task Behaviour
• Dependency Injection Using Hilt — Dependency Injection Using Hilt
• Examples and Summary — Examples and Summary
• First Non-Repeating Character — First Non-Repeating Character
• 5. Flow, StateFlow and SharedFlow Testing — Learn how to test Kotlin Flow, StateFlow and SharedFlow using runTest, virtual time and Turbine. Covers finite and infinite streams, operators, errors, cancellation, loading-success-error states, rep…
• Foreground and Background States — Foreground and Background States
• Foreground Service — Foreground Service
• Forground Service Vs WorkManager — Below are your 2 questions in 1 answer, with upload scenario, decision rules, pseudocode, and Kotlin examples.
• Fragment Object and View Lifecycle — Fragment Object and View Lifecycle
• Instrumentation Testing — Instrumentation Testing
• Introduction — Introduction
• Introduction — This section provides a brief introduction to Machine Learning, including its basic meaning, real-world use cases, and the major types of Machine Learning. It helps readers understand how machines le…
• Basic Data Types and Type Inference — Deep Kotlin tutorial covering Int, Long, Double, Boolean with examples, diagram, mistakes, and interview answers.
• if, when, Loops, and Ranges — Deep Kotlin tutorial covering if expression, when expression, for loop, while loop with examples, diagram, mistakes, and interview answers.
• Kotlin vs Java and Program Structure — Deep Kotlin tutorial covering Kotlin vs Java, file structure, packages, imports with examples, diagram, mistakes, and interview answers.
• Operators, Strings, and String Templates — Deep Kotlin tutorial covering operators, strings, string templates, comparison with examples, diagram, mistakes, and interview answers.
• val, var, and const val — Deep Kotlin tutorial covering val, var, const val, read-only reference with examples, diagram, mistakes, and interview answers.
• Common Kotlin Pitfalls in Android — Deep Kotlin tutorial covering !!, scope functions, shared mutable state, equality with examples, diagram, mistakes, and interview answers.
• Equality, Copying, and Shallow Copy Problems — Deep Kotlin tutorial covering ==, ===, data class copy, shallow copy with examples, diagram, mistakes, and interview answers.
• Any, Unit, and Nothing — Deep Kotlin tutorial covering Any, Unit, Nothing, type hierarchy with examples, diagram, mistakes, and interview answers.
• Nullable and Non-null Types — Deep Kotlin tutorial covering nullable types, non-null types, compiler checks, null handling with examples, diagram, mistakes, and interview answers.
• Reference Immutability vs Object Immutability — Deep Kotlin tutorial covering val, mutable object, immutable model, persistent data with examples, diagram, mistakes, and interview answers.
• Safe Calls, Elvis Operator, let, and Not-null Assertion — Deep Kotlin tutorial covering ?., ?:, let, !! with examples, diagram, mistakes, and interview answers.
• Safe Casts, Smart Casts, and Platform Types — Deep Kotlin tutorial covering as?, smart casts, platform types, Java nullability with examples, diagram, mistakes, and interview answers.
• Extension Functions and Scope Functions — Deep Kotlin tutorial covering extension functions, let, run, with with examples, diagram, mistakes, and interview answers.
• Functions, Parameters, Return Types, and Defaults — Deep Kotlin tutorial covering function parameters, return types, default parameters, named parameters with examples, diagram, mistakes, and interview answers.
• Lambdas, Function Types, Higher-Order Functions, and Closures — Deep Kotlin tutorial covering lambdas, function types, higher-order functions, closures with examples, diagram, mistakes, and interview answers.
• Contracts and Tail Recursion — Deep Kotlin tutorial covering contracts, tailrec, compiler hint, recursion with examples, diagram, mistakes, and interview answers.
• Destructuring, Operator Functions, and DSL Concepts — Deep Kotlin tutorial covering destructuring, operator, DSL, componentN with examples, diagram, mistakes, and interview answers.
• Inline, noinline, crossinline, and Reified Generics — Deep Kotlin tutorial covering inline, noinline, crossinline, reified generics with examples, diagram, mistakes, and interview answers.
• Value Classes and Type Aliases — Deep Kotlin tutorial covering value class, typealias, domain type, type safety with examples, diagram, mistakes, and interview answers.
• Classes, Constructors, and Properties — Deep Kotlin tutorial covering classes, primary constructor, secondary constructor, properties with examples, diagram, mistakes, and interview answers.
• Composition and Delegation — Deep Kotlin tutorial covering composition, delegation, by, repository interface with examples, diagram, mistakes, and interview answers.
• Data Classes, Enums, and Sealed Models — Deep Kotlin tutorial covering data class, enum, sealed class, sealed interface with examples, diagram, mistakes, and interview answers.
• Interfaces, Inheritance, and Polymorphism — Deep Kotlin tutorial covering interface, inheritance, open, override with examples, diagram, mistakes, and interview answers.
• Objects, Companion Objects, and Singletons — Deep Kotlin tutorial covering object, companion object, singleton, factory with examples, diagram, mistakes, and interview answers.
• OOP vs Functional Kotlin — Deep Kotlin tutorial covering OOP, functional style, pure functions, side effects with examples, diagram, mistakes, and interview answers.
• Lazy Sequences — Deep Kotlin tutorial covering Sequence, lazy processing, terminal operation, intermediate allocations with examples, diagram, mistakes, and interview answers.
• List, Set, and Map — Deep Kotlin tutorial covering List, Set, Map, ordering with examples, diagram, mistakes, and interview answers.
• map, filter, fold, and flatMap — Deep Kotlin tutorial covering map, filter, fold, flatMap with examples, diagram, mistakes, and interview answers.
• Mutable vs Read-only Collections and API Design — Deep Kotlin tutorial covering MutableList, List, read-only API, public API with examples, diagram, mistakes, and interview answers.
• Persistent Collections, Copying, Boxing, and Allocations — Deep Kotlin tutorial covering persistent collections, copying, boxing, allocations with examples, diagram, mistakes, and interview answers.
• Java Interop, Platform Types, SAM, and Checked Exceptions — Deep Kotlin tutorial covering Java interoperability, platform types, SAM conversion, checked exceptions with examples, diagram, mistakes, and interview answers.
• JVM Annotations, KAPT, KSP, and Reflection — Deep Kotlin tutorial covering @JvmStatic, @JvmField, @JvmOverloads, annotations with examples, diagram, mistakes, and interview answers.
• lateinit, lazy, Object Allocation, Lambda Capture, and Volatile — Deep Kotlin tutorial covering lateinit, lazy, object allocation, lambda capture with examples, diagram, mistakes, and interview answers.
• Visibility Modifiers, open, final, and internal — Deep Kotlin tutorial covering public, private, protected, internal with examples, diagram, mistakes, and interview answers.
• Kotlin Multiplatform: commonMain, expect/actual, and Platform Code — Deep Kotlin tutorial covering commonMain, platform source sets, expect, actual with examples, diagram, mistakes, and interview answers.
• Kotlin Multiplatform Project Structure and Limitations — Deep Kotlin tutorial covering supported platforms, project structure, dependency support, limitations with examples, diagram, mistakes, and interview answers.
• Mutex, Semaphore, and Concurrency Limits — Deep Kotlin tutorial covering Mutex, Semaphore, withLock, withPermit with examples, diagram, mistakes, and interview answers.
• Parallelism vs Concurrency — Deep Kotlin tutorial covering parallelism, concurrency, CPU cores, overlapping work with examples, diagram, mistakes, and interview answers.
• Processes, Threads, Tasks, and Concurrency — Deep Kotlin tutorial covering process, thread, task, concurrency with examples, diagram, mistakes, and interview answers.
• Race Conditions, Shared State, Synchronization, and Thread Confinement — Deep Kotlin tutorial covering race condition, shared state, synchronization, thread confinement with examples, diagram, mistakes, and interview answers.
• StateFlow, SharedFlow, Channels, State, and Events — Deep Kotlin tutorial covering StateFlow, SharedFlow, Channel, state with examples, diagram, mistakes, and interview answers.
• debounce, distinctUntilChanged, buffer, conflate, and collectLatest — Deep Kotlin tutorial covering debounce, distinctUntilChanged, buffer, conflate with examples, diagram, mistakes, and interview answers.
• Flow Operators: map, filter, combine, zip, merge, and flatMapLatest — Deep Kotlin tutorial covering map, filter, combine, zip with examples, diagram, mistakes, and interview answers.
• flowOn, retry, catch, Completion, and Cancellation — Deep Kotlin tutorial covering flowOn, retry, catch, completion with examples, diagram, mistakes, and interview answers.
• Testing Coroutines with runTest, Test Dispatchers, and Virtual Time — Deep Kotlin tutorial covering runTest, test dispatchers, virtual time, scheduler with examples, diagram, mistakes, and interview answers.
• Testing Flow, Turbine, StateFlow, SharedFlow, Retries, and Delays — Deep Kotlin tutorial covering Turbine, Flow testing, StateFlow, SharedFlow with examples, diagram, mistakes, and interview answers.
• Coroutine and Flow Performance Debugging — Deep Kotlin tutorial covering coroutine leaks, blocking detection, dispatcher misuse, context switching with examples, diagram, mistakes, and interview answers.
• Suspending vs Blocking, Continuations, and ANR Risks — Deep Kotlin tutorial covering suspending, blocking, continuation, state machine with examples, diagram, mistakes, and interview answers.
• coroutineScope, supervisorScope, and Structured Concurrency — Deep Kotlin tutorial covering coroutineScope, supervisorScope, parent-child relationship, structured lifetime with examples, diagram, mistakes, and interview answers.
• launch, async, and runBlocking — Deep Kotlin tutorial covering launch, async, Deferred, Job with examples, diagram, mistakes, and interview answers.
• Dispatchers, CoroutineContext, Jobs, and CoroutineName — Deep Kotlin tutorial covering Dispatchers.Main, Dispatchers.IO, Dispatchers.Default, CoroutineContext with examples, diagram, mistakes, and interview answers.
• Exception Handling, Cancellation, Timeouts, and Cleanup — Deep Kotlin tutorial covering exception propagation, CoroutineExceptionHandler, CancellationException, isActive with examples, diagram, mistakes, and interview answers.
• Lifecycle-aware Coroutines in Android — Deep Kotlin tutorial covering lifecycleScope, viewModelScope, Fragment view lifecycle, repeatOnLifecycle with examples, diagram, mistakes, and interview answers.
• Callback to Coroutine Migration — Deep Kotlin tutorial covering suspendCancellableCoroutine, callbackFlow, listener registration, awaitClose with examples, diagram, mistakes, and interview answers.
• Flow Builders, emit, collect, and Cold Execution — Deep Kotlin tutorial covering flow builder, emit, collect, terminal operator with examples, diagram, mistakes, and interview answers.
• Cold vs Hot Streams, Sharing, and Replay — Deep Kotlin tutorial covering cold stream, hot stream, shareIn, stateIn with examples, diagram, mistakes, and interview answers.
• Kotlin Interview Revision Roadmap — Deep Kotlin tutorial covering revision plan, topic order, common mistakes, answer structure with examples, diagram, mistakes, and interview answers.
• Phase 1 Kotlin Interview Question Bank — Deep Kotlin tutorial covering 150 interview questions, definition, example, trade-off with examples, diagram, mistakes, and interview answers.
• Longest Common Prefix — Longest Common Prefix
• Mobile Application Security — Mobile Application Security – OWASP MASVS
• Modularisation — Modularisation
• Move Zeroes — Move Zeroes
• MVI — Student-Friendly Tutorial with Lifecycle, Internal Working, Pros, Cons, Diagrams, and Use Cases
• MVVM — Here we are discussing for MVVM architecture with Examples and Dir
• Naive RAG vs Advanced RAG — Naive RAG vs Advanced RAG
• Network Security — Network Security
• Networking — Networking
• NFC Tag Connectivity and Wearable Watch Communication — NFC Tag Connectivity + Wearable Watch Communication
• Operators — Operators
• Process Importance and System Process Killing — Process Importance and System Process Killing
• Push Notification — I’ll explain it in the same style: concept, end-to-end flow, FCM setup, Android 13+ permission, notification channels, handling foreground/background states, and interview points.
• Variables, Expressions & Statements — Variables, Expressions & Statements
• RAG (Retrieval-Augmented Generation) — RAG (Retrieval-Augmented Generation)
• RAG Terminology — RAG Terminology
• RecyclerView & List Performance — RecyclerView & List Performance
• Reverse Words in String — Reverse Words in String
• Scenario-Based Use Cases — Scenario-Based Use Cases
• Secure Local Storage — This tutorial covers only: 1. Secure tokens 2. Encrypted data 3. Room database security 4. Avoiding password, OTP and MPIN storage
• Service — service
• Common Mistakes and Interview Questions — I’ll explain Android Services like a tutorial: first meaning and lifecycle, then Started/Foreground/Bound services, pseudocode, Kotlin examples, and scenario-based interview cases.
• SSL Pinning — SSL Pining
• Supervised Learning — Supervised Learning
• Tasks, Back Stack, Intents, Launch Modes and Flags — Tasks, Back Stack, Intents, Launch Modes and Flags
• Testing Room Database (DAO Testing) — Testing Room Database (DAO Testing)
• Token Management — Token Management
• Two Sum — Two Sum
• Type Inference, Data Types and String — Type Inference, Data Types and String
• 2. Unit Test with Example — Unit Test with Example
• val, var, and const val — Here we learn about kotlin variable declaration rules for var, val and const val
• Valid Anagram — Valid Anagram
• Variables, Expressions & Statements — Python - Variables, Expressions & StatementsVariablesThe major purpose of variable is to store a value from one part of program so that it can be used in other part of program....
• 3. ViewModel, State and Architecture Testing — Learn how to test Android ViewModels, UI states, user actions, one-time events, SavedStateHandle, state restoration, navigation, duplicate actions, MVVM state holders and MVI reducers using fake repo…
• WorkManager — WorkManager Tutorial — Student Friendly
• Zebra Android Scanner SDK — Zebra Android Scanner SDK