When displaying the page, Google Search will use the inserted canonical URL.
Read More: How to measure the value of SEO with CTR
Incorrect implementations may result in the creation of duplicate rel=” canonical” link tags or the modification of an existing rel=”canonical” link tag. Conflicting or numerous rel=”canonical” link tags may result in unexpected outcomes.”
Why do we care?
Check out the documentation here and make sure your implementation adheres to Google’s suggestions.