It mainly includes the following aspects:

1. Kitchen Shelves: This category mainly includes kitchen supplies racks, such as cutlery racks, spice racks, pot racks, etc. These racks are usually made of stainless steel, iron, plastic and other materials, which can effectively save kitchen space and make the kitchen more tidy.

2. Bathroom Shelves: This category mainly includes bathroom supplies racks, such as towel racks, soap racks, toothbrush racks, etc. These racks are usually made of stainless steel, aluminum alloy, plastic and other materials, which can effectively save bathroom space and make the bathroom more tidy.

3. Study Shelves: This category mainly includes study supplies racks, such as bookshelves, file racks, magazine racks, etc. These racks are usually made of wood, metal, glass and other materials, which can effectively store books, documents and other items, making the study more tidy.

4. Cloakroom racks: This category mainly includes racks for cloakroom supplies, such as clothes racks, shoe racks, hat racks, etc. These racks are usually made of wood, metal, plastic and other materials, which can effectively store clothes, shoes, hats and other items, making the cloakroom more tidy.

5. Garage racks: This category mainly includes racks for garage supplies, such as tool racks, tire racks, bicycle racks, etc. These racks are usually made of metal, plastic and other materials, which can effectively store tools, tires, bicycles and other items, making the garage more tidy.

The above is the main content of Amazon's shelf category. Different categories have different subdivisions, and you can choose according to your specific needs.