Here are some more tips on how you can improve your feed using Google Product category and product type
Let us first have a look at Google Product Category, which is the recommended field by Google which will help Google categorize your product better. In case you have not added it Google will automatically assign a product category from Google’s continuously evolving product taxonomy.
Depending on what products you are selling, you can create different product types. It will help you manage your products better. It gives more info to google about your products.
For example, If I have a store with the only product like T-shirt, so the category would be
|Apparel & Accessories||Clothing||Shirts & Tops|
Whereas, the product type can be, any of Round neck T-shirt, or, V neck T-shirt