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, simply 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 Home Depot offers a plumbing, lighting, paint, flooring, appliance, electrical, garden, and tool department. You might also mention that you know the high-level of products sold at Home Depot such as tools, washers/dryers, kitchen appliances, tools, paint, patio furniture, flowers, plumbing, and many many more!