Did you know that your store categories on eBay are searchable? That means that what you use to name your categories will show up in search engines. So, if someone searches for “Vintage Costume Jewelry” and that’s what you have one of your categories named, you have the chance to show up in their Google results.
You can have 30 characters in your category name, so choose wisely. Use as many keywords as you can, but be sure that they’re the most important ones.
A good example would be to not just name one category “pins,” but to name it “pins & brooches,” because that covers two different ways someone might be searching for inventory that could lead them to your store.