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How to Avoid Duplicate Content Own Site?
Duplicate content generally refers to substantive blocks of content within or across domains ... If your site contains multiple pages with largely identical content, there are a number of ... Be consistent: Try to keep your internal linking consistent.
before the posting the content check by using duplicate content checker
If you want to check your domain for duplicate content, you can use this tool to do so. Just type in the URL you want to check and click "Perform check." Then, the next page will show you how many duplicate pages there are of the URL you typed in.
You have to check its quality Copyscape SEO tools before using it.