Search engines pay attention to some tags, and none to others. Remember when the 'keywords' meta tag mattered? Ah, the good old days.
John Mueller placed a useful post from Zurich on the
Plenty of tags do work favorably for pages, as do
Mueller noted the default rule is "index, follow" when this meta tag is not in place on a page, or if it is not targeted to the visiting spider when it arrives.
nofollow: don't follow links from this page when looking for new pages to crawl (also see "Block or remove pages using meta tags")
nosnippet: don't show a snippet of this page when displaying it in the search results (see "Prevent or remove snippets")
noodp: don't use text from ODP (The Open Directory Project a.k.a. dmoz.org) to generate a title or snippet for this page (see "How do I change my site's title and description?")
noarchive: don't display a "Cached" link for this page in the search results (see "Prevent or remove cached pages")
unavailable_after:[date]: remove this page from the search results after the specified date and time (see "Robots Exclusion Protocol: now with even more flexibility")
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