The blog page provides customers with a landing page or index for your blog posts.
Access blog page settings through the theme editor
Every time you publish a new post to your store's blog, Shopify will generate a new page and URL for it. To access the settings for these pages, navigate to the blog in the theme editor and then click Blog page under the Sections tab.
Posts per page
Customize the number of posts that display per page using the Posts per page slider (2-10).
Promote a post
You can also elect to Emphasize first post to draw attention to the first article on the Blog page.
Grid gives you the option of displaying a Promotional image, which you can overlay with text and link to another page on your site if you wish. This will display in the right sidebar of your blog pages.
Simply upload an image by clicking Select image, then add a Heading, Subheading, and Link.