I have 1 blog for on various of subject. My native language is not English, and my target keywords are not English. My blog subjects are heath, diet, fashion, smartphone, lottery, loan, etc. I only classify categories as a medium ~ large subject, and do not use a small subject categories. Because too many categories are difficult to manage. For example, my 'health' category contains articles such as vitamin supplements, good food for cancer, good habits of sight, and how to quit smoking, etc. ( It contains articles on all topics related to health. ) And my 'DIET' category includes how to lose weight in 10 days, good food for diet, medicine for weight loss, how to lose weight by skipping rope and so on. ( It contains articles on all topics related to DIET. ) Many people say URL structure is important, but I really want to know how important category, URL structure is. Here is my question. Do I need to classify the categories in more detail? I wonder if it would be better for SEO to categorize 'categories' into double or triples. ( like 'Health >> Cancer >> Liver cancer' 'Diet >> Good food for lose weight') I'm sorry I do not have enough English. This post was written using a Google Translator.