With Online Store 2.0 and compatible themes, merchants can add sections directly to Blog post templates.
By default, all blog posts will be assigned to the Default blog post template. Create templates and assign them to blog posts to have distinct sections for different blog posts.
In order to add sections to this template, first confirm you are using a compatible version.
Confirm your theme is compatible
Open the default template
In the theme editor (Customize), use the page selector to open Blog posts, then Default blog post.
Add a section
In the left sidebar, click (+) Add section.
Select one of the available sections. Use the search field to search by section name.
Themes with numerous sections will only show some of the sections immediately. To reveal additional sections, select Show more.