A good structure usually starts by grouping products into separate campaigns based on category. For example, shoes in one campaign, bags in another. Inside each campaign, you create ad groups for more specific types, like men's shoes or women's shoes. Each ad group should have its own keywords and ad copy that match those products closely. This keeps everything organised and helps you control your budget better per product category. So what do you think matters more when structuring an e-commerce campaign, product categories or budget allocation per group?