The overall layout of your online store is controlled by your theme. Your theme uses templates to specify what types of content appear in your store. Each template can contain up to 20 sections.
Sections are modules that you can use to customize the layout of your online store. You can create templates which can then be customized by adding, removing, and rearranging sections and the blocks within. Up to 20 sections can be saved in a template, and then applied to new or existing pages and products using the theme editor or your Shopify admin.
Sections can be customized and added to any page of your online store, with the exception of gift card and checkout pages.