What Is The Canonical Tag?
 

if you have some knowledge about canonical tag? please suggest me.

The canonical tag is designed to minimize crawl errors and duplicate content in your website.The purpose is to help the search engines understand that you intend for one specific page on your website to be the true page.

A canonical tag specifies the source URL (or original content page) of a given page to a search engine such as Google. Canonical tags are used to declare a single page as its own source or for duplicate pages to reference their source / originating page. Search Engines use the canonical tag to combat duplicate content issues and assign search engine ranking value for that content to the page designated as the source URL.