What is the best thing to sell on eBay?

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I have been thinking about starting an eBay store. But I'm totally stressing about what to sell -- there are so many ideas out there. I have like six different types of items that interest me. Does anyone have any thoughts about what would be the best thing to sell on eBay and why? How can I figure out what would be the best thing to sell on eBay -- as a business, not just a hobby seller? :)