Amazon product classification is done through ASIN (Amazon Standard Identification Number). ASIN is Amazon's unique identifier for each product. Amazon's classification system mainly consists of product categories (such as electronics, household goods, books, etc.) and Amazon's own classification nodes (Category Node). Here are the general steps for classifying Amazon products:

1. First, determine which main product category your product belongs to, such as electronics, household goods, books, etc. This will help you limit the specific classification range.

2. Then, after selecting the main product category, you need to select the appropriate Amazon classification node. Amazon's classification node is a subdivision that defines the specific category to which the product belongs. You can select the relevant classification node from Amazon's classification list.

3. When selecting a classification node, it is recommended that you search for products similar to your product to see which node they are assigned to. This helps you understand Amazon's classification system and how other sellers choose classification nodes.

4. Once you have found a suitable category node, you can set and associate your product's category on the product page in Amazon Seller Central according to the options and information provided. Please note that Amazon's classification system may vary from country to country, so you need to choose the correct category node based on your region and the region where your product is sold. In addition, Amazon also provides some tools and services (such as the Category Editor in Amazon Seller Central) to help sellers more easily manage and update product classification information.