Dont say it twice
Duplicate content can be dangerous to your search engine rankings. But, what is duplicate content?
If you have a WordPress blog, you probably have a category and archives pages in your sidebar. These pages are just a collection of your posts, so you could have identical content in some of them: for example, when you have just a post in a category or in a given day, the content in that archive/category page will be the same as the post itself.
You can solve these and others duplicate content problems by using noindex, follow in your robots meta tag, using a 301 redirect or with a robots.txt file.
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