A few tips to this page
If you include a link in social media posts, the page’s featured image will be shown as the preview image.
Please, read this page https://help.shopify.com/en/manual/online-store/images/showing-social-media-thumbnail-images
A store title and description are included with the preview image.
This page will help you to know how to set up a store title and description. https://help.shopify.com/en/manual/promoting-marketing/seo/adding-keywords#set-a-title-and-description-for-your-online-store
To display a comment, enable it.
To know how to manage comments on blog posts, please read this page. https://help.shopify.com/en/manual/online-store/blogs/managing-comments