Which file would you edit to customize the layout of a product page in Shopify?

To customize the layout of a product page in Shopify, editing the product.liquid file is essential because this file specifically dictates the structure and presentation of individual product pages. Each file within a Shopify theme serves a specific purpose, and product.liquid is tailored to handle the display of all elements related to a product, such as its title, images, description, price, and other associated data.

This focused approach makes product.liquid the most appropriate choice when making changes that affect how a single product is showcased to the customer. By working directly within this file, you can implement targeted adjustments without unintentionally altering the layout of other parts of the store.

In contrast, layout files like theme.liquid and layout.liquid are more generalized and control the overarching structure of the site, including its header and footer, which would not provide the granular control needed for product-specific customizations. The index.liquid file usually relates to the homepage layout, making it irrelevant for product page customization. Thus, product.liquid is the correct and most effective file to modify for changes specific to product pages.