Link to other website without Endorsement

A simple HTML weblink is written as

<a href="https://example.org">example</a>

How do you link to a website without endorsing it?

You set the rel attribute to nofollow:

<a href="https://example.org" rel="nofollow">example</a>

The rel attribute defines the relationship between a linked resource and the current document.

From the HTML living standard:

The nofollow keyword indicates that the link is not endorsed by the original author or publisher of the page, or that the link to the referenced document was included primarily because of a commercial relationship between people affiliated with the two pages.