Be honest with the interviewer about your knowledge of departments and what is sold. If you have a lot of knowledge and experience, that is great! If not, just tell the interviewer that you do not know a lot and you look forward to learning. You might say that you know the basics and that Lowe's offers plumbing, bathroom, electrical, flooring, hardware, kitchen, paint, and tools department. You might also mention that you know the high-level of products sold at Lowe's such as tools, washers/dryers, kitchen appliances, tools, paint, patio furniture, flowers, plumbing, and many many more!