about.js

import Header from '../components/Header';

const About = () => (
    <div>
        <Header/>
        <h2>안녕하세요 저는 Velopert 입니다.</h2>
    </div>
)

export default About;

index.js

import Link from 'next/link'
import Header from '../components/Header';

const Index = () => (
    <div>
        <Header/>
        <h1>
            안녕, Next.js
        </h1>
        <h2>
            <Link href="/about">
                <a style={{background: 'black', color: 'white'}}>소개</a>
            </Link>
        </h2>
    </div>
);

export default Index;