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We have a website with lots of categories and there are problems that some subcategories have identical content on them. So, is it enough to just add different text on those problematic subcategories or we need to use "canonical" tag to main category. Same dilemma is with our search system and duplicate content. For example, "/category/sports" URL would have similar to identical content with "/search/sports" and "/search/sports-fitness/" URLs. Ranking factors is important for all different categories and subcategories. Ranking factors is also important for search individual keywords. So, the question is, how to make them somehow unique/different to rank on all those pages well? Would love to hear advices how it can be solved using different methods and how it would affect our rankings. When we actually need to use "canonical" tag and when 301 redirect is better. Thanks!