Not all your content should be crawled and indexed by Google to be shown in search results. That’s where the noindex tag comes into use. Learn when, why, and how to use noindex tags on your site.
Block Search Indexing with noindex
Google Search Central
This help document from Google explains what the noindex tag does.
Crawling & Indexing; Exclude Low-Value Pages
Top Hat Rank Blog
What content should you include in your sitemap and what should you noindex? Learn about indexing strategies.
Author Archive Pages and E-A-T
Search Engine Journal
Google’s john Mueller answers what effect would no-indexing author archives have on E-A-T.
Google: Nofollow Is Not A Substitute For Noindex
Search Engine Journal
Nofollow and noindex are not the same. Google’s John Mueller discusses noindex versus no follow.