Having past managed a retail shop myself for 13 yrs myself, I can tell you that Eric is spot on.
To add, there is almost nothing worse than an employee who can not answer basic questions about their products. It dramatically takes away from the store's credibility. Make it clear that you are there to learn and are willing to study up, even on your own time. You are expected to sell which means knowing your stuff.
Make it clear in the interview that if a customer asks a question that you don't know the answer to, you will find the answer, or someone who does. There is no shame in that. The cardinal sin in retailing/seller is making up answers due to pride.
Best to you
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