Welcome to the very first lesson of the "Introduction to Mobile Development React Native" course! In this lesson, we will embark on a journey to explore React Native, a powerful framework that allows you to build mobile applications for both iOS and Android using a single codebase. Our focus today will be on understanding the basics of React Native and running a simple "Hello, World!" application to get you started.

React Native and React share a common foundation, as both are developed by Facebook and use JavaScript. However, while React is primarily used for building web applications, React Native is designed for mobile app development. The key difference lies in the components they use. React Native provides a set of components that map to native UI elements, allowing you to create a truly native mobile experience. This means you can write your application once and run it on both iOS and Android, leveraging the power of native components for performance and a seamless user experience.

We've already set up the environment using Expo, a tool that simplifies the process of building and deploying React Native applications. Expo provides a managed workflow that handles much of the configuration for you, allowing you to focus on writing code. With Expo, you can run your applications on a simulator or emulator, or even on a physical device, making it a versatile choice for development. If you need more advanced native features later, you can always switch to the bare React Native workflow.

Let's dive into running your first React Native application. We'll start with a simple "Hello, World!" example to familiarize you with the structure of a React Native project. Here's a basic code snippet to get you started:

In this example, we import React and two core components from react-native: Text and View. The App component returns a View containing a Text element that displays "Hello, World!". The View component acts as a container, similar to a div in web development, while the Text component is used to display text. This simple application demonstrates the basic structure of a React Native app and how components are used to build the UI.

React Native provides a set of core components that are essential for building mobile applications. Two of the most fundamental components are Text and View. The Text component is used to display text on the screen, while the View component serves as a container for other components, allowing you to organize your layout. These components are the building blocks of your user interface, and understanding how to use them effectively is crucial for creating responsive and visually appealing applications.

In the "Hello, World!" example, we used a View to contain a Text element. This is a common pattern in React Native, where View components are used to structure the layout, and Text components are used to display content. As you progress through the course, you'll learn how to combine these components with others to create complex and interactive user interfaces.

In this lesson, we've introduced you to the basics of React Native, including its similarities and differences with React, and how to set up your development environment using Expo. We've also walked through a simple "Hello, World!" application, demonstrating the use of core components like Text and View. As you move forward, you'll have the opportunity to apply what you've learned in practice exercises, where you'll modify the "Hello, World!" application and experiment with these core components. This hands-on experience will solidify your understanding and prepare you for more advanced topics in React Native development.