added missing focs

src/includes/getting-started-primer/flutter.mdx

@@ -0,0 +1,5 @@
+<Note>
+
+_Sentry's Flutter SDK enables capturing sessions for Release Health, offline caching as well as reporting messages and errors._
+
+</Note>

src/platforms/dart/index.mdx

@@ -2,6 +2,15 @@
 title: Dart
 ---
 
+Pure Dart SDK used by any Dart application like AngularDart, CLI and Server.
+
+<Alert level="warning" title="Note">
+
+The Dart SDK v4.0.0 is a Prelease and is under improvements and testing.
+Latest stable version is v3.0.1, See #Resources
+
+</Alert>
+
 Get the SDK from [pub.dev](https://pub.dev/packages/sentry) by adding the following to your `pubspec.yaml`:
 
 <PlatformContent includePath="getting-started-install" />

src/platforms/dart/usage/advanced-usage.mdx

@@ -0,0 +1,14 @@
+---
+title: Advanced Usage
+sidebar_order: 2
+---
+
+## Requirements
+
+- For the use of the SDK, the minimal required Dart SDK version is `2.8.0` and Flutter SDK version is `1.17.0`
+
+## Tips for catching errors
+
+- Use a `try/catch` block
+- Use a `catchError` block for `Futures`
+- Add an `ErrorListener` to your `Isolates` and call `Sentry.captureException`

src/platforms/flutter/index.mdx

@@ -2,6 +2,15 @@
 title: Flutter
 ---
 
+Flutter SDK which depends on the [Dart SDK](/platforms/dart/) and includes support to native crashes through Sentry's native SDKs (Android and iOS), It'll capture errors in the native layer, including Java, Kotlin, C and C++ code for Android and ObjC, Swift and C for iOS.
+
+<Alert level="warning" title="Note">
+
+The Flutter SDK is a Prelease and is under improvements and testing.
+Latest stable version is the Dart SDK v3.0.1, See #Resources
+
+</Alert>
+
 Get the SDK from [pub.dev](https://pub.dev/packages/sentry_flutter) by adding the following to your `pubspec.yaml`:
 
 <PlatformContent includePath="getting-started-install" />

src/platforms/flutter/usage/advanced-usage.mdx

@@ -0,0 +1,34 @@
+---
+title: Advanced Usage
+sidebar_order: 2
+---
+
+## Requirements
+
+- For the use of the SDK, the minimal required Dart SDK version is `2.8.0` and Flutter SDK version is `1.17.0`
+
+## Uploading Debug Symbols (Android and iOS)
+
+- [iOS dSYM files](/platforms/apple/dsym/)
+- [Android NDK](/product/cli/dif/#uploading-files) Do it manually, Do not use the `uploadNativeSymbols` flag from the Sentry Gradle Plugin, it's not supported yet.
+- [Android Proguard/R8 mapping file](/platforms/android/proguard/)
+- [Flutter Web Source maps](/product/cli/releases/#managing-release-artifacts)
+
+## Known limitations
+
+- Flutter `split-debug-info` flag isn't supported yet, if this feature is enabled, Dart stack traces are not useful
+- Flutter `obfuscate` flag isn't supported yet, if this feature is enabled, Dart stack traces are not useful
+
+## Tips for catching errors
+
+- Use a `try/catch` block
+- Use a `catchError` block for `Futures`
+- The SDK already runs your init `callback` on an error handler, e.g. using `runZonedGuarded`, are captured automatically
+- Flutter-specific errors (such as layout failures), e.g. using `FlutterError.onError`, are captured automatically
+- `Isolate` errors on the `current` Isolate which is the equivalent of a main/UI thread, e.g. using `Isolate.current.addErrorListener`, are captured automatically (Only for non-Web Apps).
+- For your own `Isolates`, add an `ErrorListener` and call `Sentry.captureException`
+
+## Advanced Usage (Android and iOS)
+
+- [iOS Advanced Usage](/platforms/apple/usage/)
+- [Android Advanced Usage](/platforms/android/usage/advanced-usage/)