Responsive ecommerce page using styled components

I'm not quite sure I fully understand the logic behind this project. I implemented it up till the point I understand it. Can more than one sneaker be added to the cart? What are the details of the other items that will be added?

Are the text on the page supposed to change when the large image is changed by clicking on the small thumbnail images? I'd be glad to hear feedbacks on how my code can be improved. Thanks in advance and happy coding.