Go to "Products" in the dashboard and click on "Attributes". Click on the "Create Attribute" button:

To learn how to create filters, go to the support article. "Add Product Filter":

To learn how to add additional information, go to the support article. "Add Product Information":

To learn how to create product variations, go to the support article. "Create Product Variations":

To learn how to add brands, go to the support article. "Add Brands":
