What is canonical issue and how to resolve?
 

please describe me because i am not uses in canonical issue.

canonical issue and errors like open more then 2 different url and don't use space, comma,fullstops any other.do resolve 301 redirect add canonical tag in header.

Canonical issue is your website URL, open in different format. In order to avoid this issue ,you can use 301 redirect option.

Canonical issue means if your website is open more than one urls. for solving this we use 301 redirection or canonical tag.

Canonical issue is one which shows that the url opens in different formats thereby displaying the same page again. This results to duplication of the page.

for quality purpose and to rank website with the help of keywords.

Canonical issue is the domain which opens with www and without www this shouldn't happen to avoid this we use 301 redirect since search engine will consider the domains duplicate.

A canonical issue arises when 301 redirects are not properly in place.

Yes, you can absolutely right. Canonical issues cause duplicate content, which is targeted by panda. Thanks for your reply

canonical , is an issues which mean your website could have a duplicate issues which will create a problem in ranking to avoid it you can use canonical code in your page .

Canonical issue means your website does open with "www" and without "www" which is not good for any website. Website should open with only "www".

You can fix this error with the help of you developer.

Canonical issue is of duplicate pages, if by chance your site pages have same content and different urls but you can't redirect it so their using canonical tag. Canonical tag using in head section on your site.