You can use a div tag.
This would be an example for the basic structure.
<div id="main">
<h1>Just an example</h1>
<img>
<a>pretend link</a>
</div>
For my project, I had a header and footer section so I used the main tag to group the main content.
Basic example using main tags.
<header>
<!--introductory content goes here-->
</header>
<main id="main">
<!--this is where your main content goes-->
</main>
<footer>
<!--typically contains copyright information and other links -->
</footer>
The structure is entirely up to you.
I feel like most people choose the first option.