Android

Android Studio is your home throughout development — knowing its tools saves serious time.

You must understand app components and lifecycle before building any real screen.

Compose is the modern, recommended way to build Android UIs, replacing legacy XML.

Compose is reactive: it redraws when state changes, so you must grasp recomposition.

Every real app has multiple screens; users must move smoothly between them and pass data.

Separating UI logic from the view keeps code testable and maintainable as the app grows.

Async work (network, database) must run off the main thread to keep the UI smooth.

Most apps fetch data from servers, so you must master HTTP requests and JSON parsing.

Offline support and on-device data hugely improve UX, and Room makes it easy.

DI organises object creation and makes code easier to test and scale.

Tasks like syncing and notifications must run efficiently in the background without draining battery.

Good tests give you confidence to ship fast without breaking what works.

Users judge your app by its startup speed and scroll smoothness in the first seconds.

The final and crucial step: getting your app to users professionally via Google Play.

A shipped app needs continuous updates and monitoring of its health and usage.