JavaScript: A strong foundation in JavaScript is essential. You'll need to understand the language, its syntax, data structures, and concepts like variables, functions, and asynchronous programming.

React: React is a JavaScript library for building user interfaces. You'll need to become proficient in React to create the UI components for your mobile app. This includes understanding React's component-based architecture and state management.

React Native Fundamentals: Learn the basics of React Native, including how to set up a development environment, create a new project, and structure your code. You'll also learn about JSX (a syntax extension for JavaScript used with React), component lifecycle methods, and state management.

Navigation: Mobile apps often have complex navigation structures. React Navigation is a popular library for implementing navigation in React Native apps. You'll learn how to create different types of navigation stacks, tabs, and drawers.

Styling: You'll learn how to style your components using the built-in styles, as well as libraries like StyleSheet, which help you create responsive and platform-specific designs.

Data Management: You'll need to understand how to fetch and manage data in your app. This may involve making API calls, handling data storage, and using state management libraries like Redux or MobX.