You may have heard of meta keywords tag:
<meta name="keywords" content="zombie, undead, web development, HTML, CSS, SEO">Code language: HTML, XML (xml)While we used it at the beginning of search engine optimization, it was abused, so search engines now shuffle past the meta keywords tag like a zombie hot on the trail of fresh brains. You may still see it in the wild, but you can ignore it. And if you see it, it wouldn’t hurt to delete it.