You can start grouping your items into collections under Product > Collections in Shopify now that you have at least a few unique products listed.
Collections can be used to curate items for a certain audience (for example, children’s products), a subject (for example, bestsellers), or a product category (e.g., accessories). You may choose whether to manually add things to certain collections or to automate the process based on price, Tags, or other criteria.
Collections can be used for a variety of reasons, including: