how to set default page in next js?

i am new in next.js, in next.js default page in index.js, i want to change its path as login , can anyone please help me how to do it ? right now i am using Router.push('/login'); but it is creating flickering issue, can anyone please help for this issue ?

import Head from 'next/head'
import styles from '../styles/Home.module.css'
import Router from 'next/router'
import React, { useEffect } from "react";
import { Redirect } from 'react-router';


export default function Home(props) {
  useEffect(() => {
    const { pathname } = Router
    if (pathname == '/') {
      Router.push('/login');
    }
  }, [props]);

  return ''
}

You can add redirects to your next.config.js like this:

module.exports = {
  async redirects() {
    return [
      {
        source: '/about',
        destination: '/',
        permanent: true,
      },
    ]
  },
}