I have an HTML page that roughly looks like

```
<header>
    <h1>Header</h1>
    <h2>Subheader</h2>
</header>
<main>
    <section>
        <h1>Header</h1>
    </section>
</main>

```

Is it correct to start a section with a h1? or should it be a h2? Should the amount of h1 tags be limited to one on each page?