I'm no SEO expert myself but I think if done right you should have a relatively successful store.
I have read that your first consideration should always be how your customers will see your site -How a customer will be able to navigate through the various categories to find the products that they want to buy.
Ideally you should not clutter your store with too many categories, too many categories many increase your risk for customer confusion :) Also, you should make your listings as well as your category titles SEO focused, using keywords that a customer would use when searching for products online.
On a personal note, I like shopping on sites that offer more than 1 product line, as a shopper this will help me save time.
Hope this bit helps you with your store! And if you haven't yet do check out our very own Link hidden: Login to view
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