nofollow links

<a href="/some-page.php" rel="nofollow" >

robots.txt file

https://www.wpbeginner.com/wp-tutorials/how-to-optimize-your-wordpress-robots-txt-for-seo/

Do not index this page metadata

To prevent most search engine web crawlers from indexing a page on your site, place the following meta tag into the section of your page:

<meta name="robots" content="noindex">