React Native is a popular JavaScript library, a powerful tool that simplifies mobile app development. In this step-by-step guide, we will detail how to install React Native into your development environment. Installing React Native correctly will keep you running smoothly in your development process.

1. Installing Node.js: React Native runs on Node.js. In the first step, you can explain how to install Node.js on your computer. For this, you need to go to the official Node.js website and download the latest version and complete the installation process.
2. Installing React Native CLI: React Native Command Line Interface (CLI) is used to create and manage React Native projects. In this step, you can tell how to install React Native CLI. You can explain in detail how to install the CLI with npm (Node Package Manager) and how to use the necessary commands.
3. Installing Android Studio or Xcode: With React Native, you can develop applications that will run on Android and iOS platforms. In this step, you can tell how to install Android Studio or Xcode. It is important that you describe in detail the components and configuration steps required for both platforms.
4. Setting up Android Emulator or Physical Device: An Android emulator or a physical Android device is needed to test React Native apps. In this step, you can tell how to set up Android Emulator or connect a physical Android device. You should provide information about the emulator or device's configuration and how your React Native project will run in these environments.
5. Build and Run the Project: In this step, you can walk through the process of creating the React Native project step by step. You can provide instructions on how to run the project, explaining in detail how to create the project structure and configure the required files.

In this step-by-step guide, you learned how to install React Native. It's important to set up your development environment properly before you start using React Native. Proper setup will help you develop your React Native projects smoothly. I hope this guide has been helpful to you and will help you launch your React Native projects successfully.