The canonical issue is the most common issue of a website, it is the process of converting different versions of a URL into one.
From an SEO perspective, it becomes very important to resolve the canonical issue to get ranking on Google.
In this video, We have explained what is a canonical issue in SEO and how you can resolve this issue
Most of the website owner, do mistakes to implement the canonical tag. As a result they duplicate thier website and suffer in a long run.