If you are new to mobile development, the easiest way to get started is with Expo CLI.
It is a very easy process, just follow the steps below one by one.

Software requirement:

Node.js (download)

NPM to install the Expo CLI:

Now we can use npm(comes default with Node.js) to install the Expo CLI

• Open your terminal(run as administrator) and type the following command

 npm install -g expo-cli

it will take a little bit of time to install EXPO CLI in your system globally.

• Then run the following commands one-by-one to create a new React Native project called "MyProject":

 expo init MyProject

 cd MyProject

 npm start

This will start a development server for you

• Running your React Native application

Install the Expo client app on your iOS or Android phone and connect to the same wireless network as your computer. On Android, use the Expo app to scan the QR code from your terminal to open your project. On iOS, use the built-in QR code scanner of the Camera app.

• Modifying your app

Now that you have successfully run the app, let's modify it. Open App.js in your text editor of choice and edit some lines. The application should reload automatically once you save your changes.

• That's it!

Congratulations! You've successfully run and modified your first React Native app.

References:

React Native
Expo
Node JS
NPM

Hope you have enjoyed this and gain something from it. Waiting for your feedback. ✔

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Happy Coding! 💻 😀