How to add categories on shop page using WooCommerce
This documentation assumes that you are using WooCommerce plugin for your shop page.
You can show categories of products on your shop page. This can be achieved by navigating from your Dashboard to WooCommerce->Settings->Products(tab)->Display(tab) and select the desired option from 'Shop page display'.
Here is an example with our theme Oblique displaying categories and products on the shop page.