Create a custom post type for your products.. Then add fields like product name, price, discount, and image. After that you cann css in your products and create its gallery. No need to create a child theme.

The code I wrote does allows me to see the product descriptions.

With that said. What I require now is the extension for my php code, that would allow me see the description under each product, but only see a specific amount of the descriptions. What I'm looking for is to have a 4 line short description under each product.

And by 4 line, I mean -1 -2 -3 -4, when inside the product, I've 1-9

Additional Question:

For doing this, do I need to edit another file inside my child theme? If, which file and what code could I use to complete this.

Hopefully the picture gives y'all an idea of what I mean