How To Use Canonical Url In SEO

[HealthCabinet]

Hi, 

I am on my new site Health Cabinet  SEO implementation.

Wrote 25 articles while publishing my site articles got Canonical Url option in SEO.

Just wanted to know What is Canonical Url and how to use it in order to have Good impact SEO. 

[harrybin]

you must search on google and check some youtube videos you will find your ans

[Paget96]

really? xD