I have been experiencing a ranking drop for my site in the last few days.
I found there about six pages that have been indexed with the same eta tags but showing different content. Is this really bad in terms of SEO?
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I will allow myself to give an answer from the point of view of Google because I know a little with their documentation.
Duplicate content (regardless of location - in the metadata or in the main content of the web page) has the following negative result. The presence of duplicate content of the website does not allow Google to determine the relevant content for a search query. In this case, Google may simply ignore the duplicate content of your website and use the content of another website that may not have duplicate content.
To eliminate this problem, Google recommends using canonical meta-links for the main content.
To create relevant meta titles, Google recommends the following:
Avoid repeated or boilerplate titles. It’s important to have distinct, descriptive titles for each page on your site.
Google gives the similar recommendation for creating relevant meta descriptions:
Differentiate the descriptions for different pages. Identical or similar descriptions on every page of a site aren't helpful when individual pages appear in the web results. In these cases, we're less likely to display the boilerplate text. Wherever possible, create descriptions that accurately describe the specific page. Use site-level descriptions on the main home page or other aggregation pages, and use page-level descriptions everywhere else.
Therefore, duplicate content can have a negative impact on your web pages in search results.