I found this content in my language and that seems relevant to me:
- Duplicate content
Risk: Search Engines, by definition, hate duplicate content that prevents them from understanding how to accurately index the relevant pages in its index. In terms of linking, he adds that "there is a loss: if ten links point to two identical pages, it is less rewarding than if they all point to a single page with unique content."
Detection and Tools: To manually retrieve duplicate content, simply take a short excerpt from the page and search it in quotation marks on Google ("your search") to see if