Go online to any of this online shopping store and try to identify what data are needed. I don't think your assignment is asking for specific, definitive set. It's just looking for the most common data. If you can't identify those by observing online shopping stores, then programming will be a very difficult subject for you.
Now if you wanna be specific with what data, this is the part where you have to interview exactly the business stakeholders. If you are the business person, then you have to ask yourself what data you need. But if it's let's say ABC Corp Online Shop. You send them an email or call them and make an appointment to ask what their business needs and workflow. You can then determine what they need.
However interviewing and analysis are totally separate skillsets from prorgramming. So if you suck on these, it's fine. It's part of the learning process. You can't be good at everything but you can try to be okay with everything.