The canonical tag can be tricky for some people to understand at the best of times but to coin a simple description it's the tag which dictates which is the primary version of a page..
It can result in the wrong page being served for a query and that page can fall down the rankings if it's not related to said query..
We asked the team at Assertive Media for their views on the most common reasons and through the course of this guide we'll investigate the main ones..
Most of the time this is because it has a lot of bad links pointing to it although there have been recent cases of a site being hacked and therefore being manually penalized..
Regardless of the group you fall into it's safe to say that falling out of Google's organic results is a recipe for disaster.
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