React Router Dom

Install react-router-dom using the following command

npm install --save react-router-dom

create a new file (MainRouter) in your project directory

import { BrowserRouter, Route, Link } from "react-router-dom"; //import the package
import SignIn from "../SignIn" //import your signIn page
import SignUp from "../SignUp" //import your signUp page

function MainRouter(){
            <div className="container">
                    <Route path="/signIn" component={SignIn} />
                    <Route path="/signUp" component={SignUP} />

export default MainRouter

Why you need this

react-router-dom package allows you to dynamically navigate the pages in your browser(client side) without refreshing the page,it a nice way to handle navigation in single page application