Think like a buyer!
The first step to successful selling is to choose the right category for your item. Remember to think like a buyer. Where would a typical buyer search for your item? Before you choose a category, do some research to see what categories might be appropriate. 

Not every buyer will think to look for your item in the first category you choose. That's why selecting a second category may help you reach a wider audience. Make sure your category can accurately be described as belonging to the second category.

eBay makes recommendations for a second category as part of the Sell Your Item process.
4
4