If you’re looking for a side-hustle to help pay for Christmas, the smartphone app “Whatnot” is becoming a popular way to make fast money on things you already have around the house. Part eBay and part ...

If you follow any resellers or secondhand enthusiasts, you may have started hearing more and more people mentioning the “Whatnot App” lately. “Going live soon on Whatnot,” users might warn. Some ...