Section on every page
Online Store 2.0 introduces a new JSON template format that lets you add new and existing sections to most pages in your theme, and add and remove sections from any page directly in the Shopify theme editor. This feature lets merchants personalize many more aspects of a store without relying on a developer. It also lets developers build maintainable themes with more modular components. For more information, see Shopify 2.0.
Some core pages such as: Password page, Checkout page, Account page, Order page will not support sections on these pages due to the structure of Shopify. To create pages and add sections to every page you want, see this link.
App support in sections
From your Shopify admin, go to Online Store > Themes.
Find the theme that you want to edit, and then click Customize.
Navigate to the page where you want to add the app section.
Click Add section.
From the drop-down menu, in the Apps section, select the app that you want to add to the page or click the Search bar and enter some text to search through your installed apps.
Optional: move the app section to the place you want it on the page, and customize the block using any available settings.
Click Save.
The app is added as a block in an Apps section. You can add additional app blocks to the section. You can also add multiple Apps sections to a page.