How can you create a custom page template in Shopify?

Creating a custom page template in Shopify involves adding a new Liquid file to the templates directory. This process allows you to define unique page layouts that can be assigned to specific pages in your store. Each Liquid file represents a different template, enabling you to structure the page content, define sections, and control how elements are displayed on the page.

When you create a new Liquid file, you typically follow a naming convention that reflects the type of page you are creating. For instance, if you want to create a custom page template for an "About Us" page, you might name the file page.about.liquid. Once this file is in place, you can use Shopify's online admin to select this custom template when creating or editing a page, allowing for tailored content and styling without impacting existing templates.

The other options provided do not achieve the goal of creating a custom page template effectively. Modifying the existing theme's CSS only changes styles and does not add new structural elements or templates. Changing the theme's main layout file affects the entire theme layout rather than creating a specific custom template. Finally, altering the store's settings directly does not allow for customization of page templates, as settings primarily control store-wide configurations rather than individual page structures.