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":