Using Noindex, Nofollow HTML Metatags: How to Tell Google Not to Index a Page in Search
Hubspot
JULY 19, 2016
For marketers, one common reason is to prevent duplicate content ( when there is more than one version of a page indexed by the search engines, as in a printer-friendly version of your content) from being indexed. So, how do you go about "de-indexing" certain pages from search engines? 2 Ways to De-Index a Webpage From Search Engines.
28 
Let's personalize your content