Marshmallow
Schools give you case material and expect clean solutions. eCommerce doesn’t work like that. It’s about judgment calls, based on reams of data, which you push live and monitor carefully. In round one, you might only get 3 out of 10 showing a positive return. The key is to very quickly pause the bad 7, double down on the positive 3, and launch 7 more. Rinse and repeat.