How to implement navbar using react

I am trying to learn React on my own but having trouble creating a simple navbar for my web page. I would like to place the navbar in the index.jsx file so that it shows up at the top of the page; below is what I have in the index.jsx file.

import React from 'react'
import { render } from 'react-dom'
import App from './components/App';

const node = document.querySelector('#app')

render(<App />, node);

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