Are you passionate about the product? Your passion for and genuine interest in a particular niche market or product will give you a competitive edge over other sellers - your focus will differentiate your store from others that are more general in their product coverage. By choosing a category that you are passionate about, you will have a greater chance of enjoying the journey of creating and managing an online store, which will require patience and the ability to overcome adversity. In a way, opening an online store around one of your hobbies or interests allows you to reallocate time productively that you would have spent on your hobby anyways.
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