Flutter is an open source framework for building beautiful, natively compiled, multi-platform applications from a single codebase. Understanding Flutter as a tool for building mobile applications
React Native, Kotlin, and Java, Flutter is much better regarding having a Single Codebase for Android and iOS, Reusable UI and Business Logic, high compatibility, performance, and productivity.
Before diving into Flutter, it is important to have a strong grasp of Dart programming, familiarity with Android Studio, and knowledge of web scripting languages like HTML, JavaScript, and CSS.