4 solutions for treating the duplicate content problem
1. Consistency
As you saw in the earlier section, a majority of instances of duplicate content happen when the URL structure is inconsistent.
Your best solution here is to standardize your preferred link structure, as well as proper use of canonical tags. It could be the www or the non-www version. Or maybe the HTTP or the HTTPs version — whatever it is, it needs to be consistent.
You can tell Google about your preferred URL version by setting your preference in your Google Webmasters account.
2. Canonicalization
Most CMSes allow you to organize your content using tags and categories. Often when users perform tag or category-based searches, the same results show up. As a result, the search engine bots might think that both the URLs offer the same content.
3. Noindex meta tag
Meta tags are a way for webmasters to give the search engines important information about their sites.
The noindex meta tag tells the search engine bots to not index a particular resource.
People often confuse the noindex meta tag with the nofollow meta tag. The difference between them is that when you use the noindex and nofollow tag, you’re asking the search engines to not index and follow the page.
4. Use the hreflang tag to handle localized sites
When you use translated content, you should use the hreflang tag to help the search engines choose the right version of your content.
If you have your site in English and you have translated it into Spanish to serve the local audience, you should add the tag, “<link rel=”alternate” href=”
http://example.com” hreflang=”en-es” />” to the Spanish version of your site.