You are using Apostrophe( ’ ) two times, instead, you have to use the double quote( " ).
You can still use a single Apostrophe but it is bad practice.
So hence your code should look like this :
<h2>CatPhotoApp</h2>
<main>
<a href="https://freecatphotoapp.com"> cat photos</a>
<img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
<p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
</main>