### Create Next.js [`App` Component](https://nextjs.org/docs/pages/building-your-application/routing/custom-app)

Create `pages/_app.jsx` file with the following content:

```jsx filename="pages/_app.jsx"
export default function App({ Component, pageProps }) {
  return <Component {...pageProps} />
}
```

### Ready to Go!

Now, you can create your first MDX page as `pages/index.mdx`:

```mdx filename="pages/index.mdx"
# Welcome to Nextra

Hello, world!
```

And run the `dev` command specified in `package.json` to start developing the
project! 🎉

```sh npm2yarn
npm run dev
```
