Hi @Heytherethanks, best practice is to make affiliate links nofollow links. In Squarespace that means using a Markdown block which is available on the Personal plan. Here's an example of what you'd put in a Markdown block for an affiliate link:
<a href="http://affiliatelinkhere.com/" rel="nofollow" target="_blank">your link in text</a>
You can use rel="nofollow" to let search engines know that your link shouldn't count in ranking the linked page. And target="_blank" opens the link in a new window, which is best practice for linking to sites outside your own.
The code is too long for the window above, but if you click inside the code block and select all you can paste it into a text editor to see the whole thing.