I'm building a new website and am setting up internal link structure with subcategories and hoping to do so with best Seo practices in mind. When linking to a subcategory's main page, would I make the internal link www.xxx.com/fishing/ or www.xxx.com/fishing/index.html or does it matter? I'm just trying to avoid duplicate content I guess, if Google saw each page as a separate page. Any other cautions when using subdirectories in my navigation?
