To have or to not have multiple categories [duplicate]

1. Why you should avoid duplicate content?
2. Does duplicate content hurt SEO?
3. How do you describe duplicate content?

Why you should avoid duplicate content?

Why prevent duplicate content on your site? Duplicate content will hurt your rankings. At the very least, search engines won't know which page to suggest to users. And as a result, all the pages those search engines see as duplicate are at risk of being ranked lower.

Does duplicate content hurt SEO?

Is Duplicate Content Bad For SEO? Officially, Google does not impose a penalty for duplicate content. However, it does filter identical content, which has the same impact as a penalty: a loss of rankings for your web pages.

How do you describe duplicate content?

Duplicate content is content that appears on the Internet in more than one place. That “one place” is defined as a location with a unique website address (URL) - so, if the same content appears at more than one web address, you've got duplicate content.