What is Canonical Tag in SEO?
Canonical tags have a big role in search engine optimization. If you have multiple pages on your website and many of those pages have information that means duplicates, then you can host canonical tags by hosting one page from all the other pages and the rest of the pages that the search engine knows This page is duplicate content and as you have said so it does not even punish you
For example, if you created a page related to Rajasthan on your site and named it My Rajasthan ….. then made one and named it lovely Rajasthan …. but both have same content …… .. So by placing the canonical tag on the lovely Rajasthan page, you can tell the search engines that this page is my canonical of Rajasthan