diff --git a/README.md b/README.md
index 237caeb..f2bccc0 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,262 @@ In addition, **you don't need to learn everything from this roadmap**. So we rec
   <img alt="Roadmap" src="images/android_developer_roadmap.png">
 </picture>
 
+
+  ##  Content list 
+- - [ ]   **Application Fundamentals**  
+  - - [ ]    Languages  
+      - - [ ]    Kotlin  
+      - - [ ]    Java  
+      - - [ ]    C++ (JNI)  
+  - - [ ]    Android Package  
+      - - [ ]    APK  
+      - - [ ]    AAB  
+- - [ ]    **Android Operating System**  
+  - - [ ]    Multi-User Linux  
+  - - [ ]    File Permissions  
+  - - [ ]    Resource Isolations  
+  - - [ ]    Process Management  
+- - [ ]    **Android Platform Architecture**  
+  - - [ ]    The Linux Kernel  
+  - - [ ]    Hardware Abstraction Layer  
+  - - [ ]    Android Runtime  
+  - - [ ]    Native Libraries  
+  - - [ ]    Java API Framework  
+  - - [ ]    System Apps  
+- - [ ]    **App Manifest**  
+  - - [ ]    Package  
+  - - [ ]    Application ID  
+- - [ ]    **App Components**  
+  - - [ ]    Activity (detailed later)  
+  - - [ ]    Service  
+  - - [ ]    Broadcast Receiver  
+  - - [ ]    Content Provider  
+  - - [ ]    Intent  
+      - - [ ]    Intent Filters  
+      - - [ ]    Explicit Intents  
+      - - [ ]    Implicit Intents  
+- - [ ]    **App Architecture**  
+- - [ ]    **App Entry Points**  
+  - - [ ]    Activities  
+      - - [ ]    Activity Lifecycles  
+      - - [ ]    Activity State Changes  
+      - - [ ]    Task and Back Stack  
+      - - [ ]    Parcelables and Bundles  
+  - - [ ]    App Shortcuts  
+- - [ ]    **App Navigation**  
+  - - [ ]    Navigation Component  
+      - - [ ]    Navigation Graph  
+      - - [ ]    Global Actions  
+      - - [ ]    Destinations  
+      - - [ ]    DeepLink  
+  - - [ ]    Fragments  
+      - - [ ]    DialogFragment  
+      - - [ ]    BottomSheetDialogFragment  
+      - - [ ]    Fragment Lifecycles  
+      - - [ ]    Fragment State Changes  
+      - - [ ]    Fragment Manager  
+      - - [ ]    Fragment Transactions  
+  - - [ ]    App Links  
+      - - [ ]    TabLayout  
+      - - [ ]    ViewPager  
+      - - [ ]    ViewPager2  
+      - - [ ]    Custom Back Navigation  
+- - [ ]    **App Startup**  
+- - [ ]    **Dependency Injection** (detailed later)  
+- - [ ]    **Architecture Components**  
+  - - [ ]    UI Layer  
+      - - [ ]    ViewBinding  
+      - - [ ]    DataBinding  
+      - - [ ]    Lifecycle  
+      - - [ ]    ViewModel  
+      - - [ ]    LiveData  
+      - - [ ]    Paging  
+  - - [ ]    Data Layer  
+      - - [ ]    Data Store  
+      - - [ ]    WorkManager  
+- - [ ]    **Design Patterns**  
+  - - [ ]    Builder Pattern  
+  - - [ ]    Factory Pattern  
+  - - [ ]    Dependency Injection  
+      - - [ ]    Dagger  
+      - - [ ]    Hilt  
+      - - [ ]    Koin  
+      - - [ ]    Kodein  
+  - - [ ]    Repository Pattern  
+  - - [ ]    Observer Pattern  
+      - - [ ]    Flow  
+      - - [ ]    RxJava/RxKotlin  
+      - - [ ]    LiveData  
+- - [ ]    **Architecture**  
+  - - [ ]    MVVM  
+  - - [ ]    MVP  
+  - - [ ]    MVI  
+  - - [ ]    MVC  
+  - - [ ]    Clean Architecture  
+- - [ ]    **Network**  
+  - - [ ]    OkHttp  
+      - - [ ]    Interceptor  
+  - - [ ]    Okio  
+  - - [ ]    Retrofit  
+  - - [ ]    Ktor  
+  - - [ ]    Volley  
+  - - [ ]    Apollo-Android  
+- - [ ]    **Image Loading**  
+  - - [ ]    Glide  
+  - - [ ]    Fresco  
+  - - [ ]    Coil  
+  - - [ ]    Picasso  
+- - [ ]    **Local Storage**  
+  - - [ ]    SQLite  
+      - - [ ]    SQLDelight  
+      - - [ ]    Room  
+  - - [ ]    DataStore  
+  - - [ ]    Realm  
+  - - [ ]    SharedPreferences  
+- - [ ]    **Asynchronous**  
+  - - [ ]    Coroutines  
+  - - [ ]    RxJava/RxKotlin  
+  - - [ ]    Thread  
+  - - [ ]    WorkManager  
+- - [ ]    **User Interface**  
+  - - [ ]    Layouts  
+      - - [ ]    ConstraintLayout  
+      - - [ ]    MotionLayout  
+      - - [ ]    LinearLayout  
+      - - [ ]    FrameLayout  
+      - - [ ]    Material  
+      - - [ ]    RecyclerView  
+  - - [ ]    Design Guides  
+      - - [ ]    Material  
+      - - [ ]    Material You  
+      - - [ ]    Neumorphism  
+  - - [ ]    Styles  
+      - - [ ]    Light Theme  
+      - - [ ]    Dark Theme  
+  - - [ ]    Message  
+      - - [ ]    Toast  
+      - - [ ]    Snackbar  
+      - - [ ]    Notification  
+  - - [ ]    Animation  
+      - - [ ]    ValueAnimator  
+      - - [ ]    ObjectAnimator  
+      - - [ ]    Lottie  
+      - - [ ]    Material Motion  
+- - [ ]    **Compose UI:**  
+  - - [ ]    Recomposition  
+      - - [ ]    Snapshot  
+  - - [ ]    State:  
+      - - [ ]    State Hoisting  
+          - - [ ]    MutableState  
+          - - [ ]    remember  
+          - - [ ]    rememberSaveable  
+  - - [ ]    Side-Effects:  
+      - - [ ]    LaunchedEffect  
+      - - [ ]    DisposableEffect  
+      - - [ ]    produceState  
+      - - [ ]    derivedStateOf  
+      - - [ ]    snapshotFlow  
+  - - [ ]    Theming:  
+      - - [ ]    Material  
+          - - [ ]    Color  
+          - - [ ]    Typography  
+          - - [ ]    Shape  
+      - - [ ]    Custom  
+          - - [ ]    Dimens  
+          - - [ ]    Factories  
+          - - [ ]    Data  
+  - - [ ]    Modifier:  
+      - - [ ]    Modifier Order  
+      - - [ ]    Chaining  
+      - - [ ]    Composed Modifier  
+  - - [ ]    Layout:  
+      - - [ ]    Column  
+      - - [ ]    Box  
+      - - [ ]    Row  
+      - - [ ]    ConstraintLayout  
+  - - [ ]    List:  
+      - - [ ]    LazyColumn  
+      - - [ ]    LazyRow  
+      - - [ ]    LazyVerticalGrid  
+      - - [ ]    LazyPagingItems  
+  - - [ ]    Image:  
+      - - [ ]    Icon  
+      - - [ ]    Image  
+          - - [ ]    coil-compose  
+          - - [ ]    Landscapist  
+  - - [ ]    Text:  
+      - - [ ]    TextField  
+      - - [ ]    OutlinedTextField  
+      - - [ ]    ClickableText  
+  - - [ ]    Graphics:  
+      - - [ ]    Surface  
+      - - [ ]    Canvas  
+  - - [ ]    Gestures:  
+      - - [ ]    Scrolling  
+      - - [ ]    Dragging  
+      - - [ ]    Swiping  
+      - - [ ]    Zooming  
+  - - [ ]    Animation:  
+      - - [ ]    AnimatedVisibility  
+      - - [ ]    AnimatedContent  
+      - - [ ]    Crossfade  
+      - - [ ]    rememberInfiniteTransition  
+      - - [ ]    animateContentSize  
+      - - [ ]    updateTransition  
+      - - [ ]    animate*AsState  
+      - - [ ]    AnimationState  
+      - - [ ]    animate  
+      - - [ ]    Animatable  
+      - - [ ]    Animation  
+  - - [ ]    CompositionLocal:  
+      - - [ ]    CompositionLocalProvider  
+      - - [ ]    compositionLocalOf  
+      - - [ ]    staticCompositionLocalOf  
+- - [ ]  **Service:**  
+  - - [ ]    Google:  
+      - - [ ]    Google Play Services  
+      - - [ ]    Google Maps  
+  - - [ ]    Firebase:  
+      - - [ ]    Authentication  
+      - - [ ]    Crashlytics  
+      - - [ ]    Remote Config  
+      - - [ ]    Cloud Messaging  
+      - - [ ]    FiresStore  
+      - - [ ]    Realtime Database  
+  - - [ ]   Advertisements:  
+ 	  - - [ ]    Google AdMob  
+	  - - [ ]    Meta Audience Network  
+	  - - [ ]    MoPub  
+ - - [ ]  **Code Analysis & Testing**:  
+	- - [ ]    Linter:  
+	  - - [ ]    Ktlint  
+	  - - [ ]    Detekt  
+	  - - [ ]    Android Lint  
+	- - [ ]    Debugging:  
+	  - - [ ]    Timber  
+	  - - [ ]    LeakCanary  
+	  - - [ ]    Stetho  
+	  - - [ ]    Chucker  
+	- - [ ]    Unit Testing:  
+	  - - [ ]    Unit Test:  
+	      - - [ ]    JUnit  
+	      - - [ ]    Kluent  
+	      - - [ ]    Mockk  
+	  - - [ ]    Android Test:  
+	      - - [ ]    Robolectric  
+	      - - [ ]    Espresso  
+	      - - [ ]    Kaspresso  
+	- - [ ]    Benchmark  
+- - [ ]  **CI/CD**:  
+  - - [ ]    GitHub Actions  
+  - - [ ]    Jenkins  
+  - - [ ]    Travis CI  
+  - - [ ]    Circle CI  
+  - - [ ]    Bitrise  
+- - [ ]  **QA & App Publishing**:  
+  - - [ ]    Firebase App Distribution  
+  - - [ ]    Google Play
+
 ## ✍️ Articles
 
 <a href="https://getstream.io/blog/android-developer-roadmap/"><img src="images/article.png" /></a><br>
@@ -51,7 +307,7 @@ If you're interested in building a robust chat, video/audio calls, or livestream
 ## 📱 Demo Application
 
 This project includes a demo project which shows the roadmap image. You can download the latest APK on the [Releases](https://github.com/skydoves/android-developer-roadmap/releases).
-
+  
 ## 🤝 Contribution
 
 This project doesn't cover everything, so if something is missing or should be fixed, anyone can contribute to this project by following the [CONTRIBUTING](CONTRIBUTING.md) guides.