Mobile app development

Steps

Languages and design

1. 1 Kotlin for AndroidLearn Kotlin's syntax, null safety, classes and coroutines, since it is the main language for modern Android apps.

   • Kotlin Documentation kotlinlang.orgfree

     Official Kotlin language documentation with a tour, reference and guides for Android, server and multiplatform use.

   I finished this step
2. 2 Swift for Apple platformsLearn Swift's optionals, structs, protocols and closures, the language foundation for every iPhone and iPad app you will build.

   • Swift Documentation swift.orgfree

     Official documentation of the Swift language, including the language guide, standard library and API design guidelines.

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3. 3 Platform design guidelinesStudy how each platform handles navigation, typography, gestures and accessibility, so your apps feel at home on Android and iOS.

   • Material Design 3 m3.material.iofree

     Google's design system for Android and other platforms, with components, layout, colour and accessibility guidance.

   • Human Interface Guidelines developer.apple.comfree

     Apple's design guidance for apps on its platforms, covering layout, navigation, accessibility and platform conventions.

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Native development

1. 4 Android apps with Jetpack ComposeFollow the official courses to build Android screens with Compose, manage state, navigate between screens and store data locally.

   • Android Developers Courses developer.android.comfree

     Free official courses for building Android apps with Kotlin and Jetpack Compose, from first app to architecture.

   • Android Developer Documentation developer.android.comfree

     Official reference and guides for the Android platform, its APIs, tooling and app quality requirements.

   I finished this step
2. 5 iOS apps with SwiftUIBuild complete iOS apps step by step with SwiftUI views, data flow and lists, then explore the platform frameworks in depth.

   • SwiftUI Tutorials developer.apple.comfree

     Step-by-step official tutorials that build complete iOS apps with SwiftUI, covering layout, data and navigation.

   • Apple Developer Documentation developer.apple.comfree

     Official documentation for building apps on iOS, iPadOS, macOS, watchOS and visionOS with Apple frameworks.

   I finished this step

Cross-platform development

1. 6 FlutterWrite one Dart codebase that renders the same widgets on Android and iOS, and compare that model with native development.

   • Flutter Documentation docs.flutter.devfree

     Official guides and API reference for building cross-platform mobile, web and desktop apps with Flutter and Dart.

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2. 7 React Native with ExpoUse React and JavaScript to build native mobile apps, letting Expo handle project setup, device testing and builds.

   • React Native Documentation reactnative.devfree

     Official guide to building native iOS and Android apps with React and JavaScript, from setup to native modules.

   • Expo Documentation docs.expo.devfreemium

     Documentation for Expo, a framework and toolset that simplifies building, testing and publishing React Native apps.

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3. 8 TypeScript for mobile code (optional)Add static types to React Native projects to catch mistakes early and keep a growing mobile codebase easy to change.

   • TypeScript Handbook typescriptlang.orgfree

     Official handbook for the TypeScript language, explaining its type system and features from the basics through advanced topics for JavaScript developers.

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Backend, testing and release

1. 9 Backend servicesConnect your app to authentication, cloud databases, storage and push notifications without running your own servers.

   • Firebase firebase.google.comfreemium

     Backend services for mobile and web apps, including authentication, databases, push notifications and analytics.

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2. 10 Testing mobile appsWrite fast unit tests for app logic and fewer UI tests on top, following the test pyramid to keep releases reliable.

   • JUnit 5 junit.orgfree

     Standard programmer-friendly testing framework for Java that provides foundation for developer-side unit testing.

   • Martin Fowler's Bliki martinfowler.comfree

     An influential software engineering blog providing in-depth analysis of programming practices, testing, and agile principles.

   • Google Testing Blog testing.googleblog.comfree

     Insights and practical articles on testing practices, test automation at scale, and engineering productivity from Google.

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3. 11 Publishing to the app storesLearn app signing, store listings, review rules and staged rollouts for Google Play and the App Store before your first release.

   • Android Developer Documentation developer.android.comfree

     Official reference and guides for the Android platform, its APIs, tooling and app quality requirements.

   • Apple Developer Documentation developer.apple.comfree

     Official documentation for building apps on iOS, iPadOS, macOS, watchOS and visionOS with Apple frameworks.

   I finished this step