<section>:

<h1>Choosing an Apple</h1>
<section>
  <h2>Introduction</h2>
  <p>
    This document provides a guide to help with the important task of choosing
    the correct Apple.
  </p>
</section>

<section>
  <h2>Criteria</h2>
  <p>
    There are many different criteria to be considered when choosing an Apple 
    size, color, firmness, sweetness, tartness...
  </p>
</section>

h1,
h2 {
  margin: 0;
}

<div>
  <h2>Heading</h2>
  <img>some image</img>
</div>

<section>
  <h2>Heading</h2>
  <img>some image</img>
</section>