Of course, an online store consists of more than just a homepage, some collections and a few products. There also need to be pages which answer questions that your visitors have about your service. What else do you need to answer so that they can make their order?
Beyond simply answering questions, a blog is a great way to express the personality of your store. People love to know that there are real people behind a website and posting good articles on your blog is also a great way to attract interest in your store.