First up, I would like to give credit where credit is due. The credit in the following goes to Xavier Deioffre of Facem Web (a web-solutions firm based in France). And this is a loose translation… In fact, you can read his original post here. And yes, this article has been rigged with a rel-canonical 🙂
I find myself quite often speaking about duplicate content. Everyone wants great content for their site. No issue there. I totally understand that.
But the thing most leaders, exec’s, marketing directors, etc. need to quickly understand is:
You just can’t go gallivantin’ around, grabbin’ others’ articles and pasting them in your blog…
At least not without a “best practices” use of a rel=canonical.
What the heck is that, you ask?
rel = canonical: Web anti-duplication solution?
When a website is developed, it is very tempting populate it with a lot of content, especially text content, because “if I want to be referenced, it is necessary that my site have content.” And you’re right; what is the point of having a website if it is not to appear in search engines?
So YES, it is the rule of content … ; However, there is the risk of duplication of content. The “canonical” tags are a remedy that we will detail.
Duplication of content, what is it?
Duplication of content can take many forms. According to Google, this duplication of content can exist with the case of two different sites (ie two different URLs). It’s very common when you put up a news website for example. A news is taken over by another site, then another etc. We thus find many similarities between pages despite different URL.
The problem is very common on blogs like WordPress and especially e-commerce sites. For the latter example, the same item or product can be found via dynamic URL (categorize its products requires the use of the rel = canonical tag for each product).
There are similar problems with directories, which demonstrates that the misuse of directories should not be used for a website.
You can index a site with or without www; it is also a question of duplicate content, have multiple URLs for a home page also, which raises the issue of referrals.
Change its URL can also be problematic (404 errors) but does not specify the address change. Therefore the 301 redirect is used to avoid penalizing SEO.
The duplicate content appears when a high level of similarity between two pages appears. On this level, we do not have precise. Though in itself, the rel = canonical is one of the remedies to this problem
Use the rel = canonical tag
This tag is inserted in the <head> section of html code as soon as possible in order to be properly taken into account by the Panda algorithm . Obviously, it is valid for pages indexed and is useless on the noindex.
It is essential to verify that the content page is (not 404, for example), which could occur if you change the URL of your page
This is one wherein a beacon indicates an absolute URL, namely URL link and taking over all the states so, regardless of the location of the source document.
It avoids the use of the beacon in paginated pages (that is to say, pages 2,3,4, etc. which refer to a page while 1 have different contents) and finally is put that one rel = canonical tag per page.
Use the rel = canonical WordPress
For solutions developed in WordPress, developed by Yoast plugin will happily use it. The canonical URL is in the advanced tab of Yoast SEO Plugin (indicate the absolute url):