Ok very simple example with react router.

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npx create-react-app testrq-router && cd $_ && yarn add react-router-dom

Modify index.js to:

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import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import { BrowserRouter as Router, Route, Routes } from "react-router-dom";
import { Header, Homepage, Aboutpage } from './App';

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(
  <Router>
    <Header/>
    <Routes>
      <Route path="/" element={<Homepage />} />
      <Route path="/about" element={<Aboutpage />} />
    </Routes>
  </Router>
);

Modify App.js to:

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import logo from './logo.svg';
import './App.css';

import { Link } from 'react-router-dom';

const Header = () => {
    return (
        <div>
                <p>Header</p>
        </div>
    )
};

const Homepage = () => {
    return (
        <div>
                <h1>Homepage </h1>
                <Link to='/about'>Go to Aboutpage</Link>
        </div>
    )
};

const Aboutpage = () => {
    return (
        <div>
                <h1>Aboutpage<\/h1>
                <Link to='/'>Go to Homepage</Link>
        </div>
    )
};
export {Header, Homepage, Aboutpage } ;

base on understanding-links-in-reactjs mod to react-route v6

Header Component already placed as not rerender component.