Switch on approval and every new listing waits for the administrator before it goes online. The pending page lists all of them with the seller, the price and the date; approve them, or reject them with a reason that the seller sees.
A curated marketplace attracts better buyers. The approval queue lets you keep out low-quality, misleading or prohibited listings before anybody sees them.
Rejected listings go back to the seller with your note; when the seller corrects them, they return to the queue automatically.
For open marketplaces, switch approval off and use reports, banned words and AI moderation instead.