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Unlike other modules, the blog content module is not made up of a single tag, but rather a combination of conditional logic and for loops. If statements are used to customize your markup based on whether you are looking a a single post or listing layout. For loops are used to iterate through your content and list different selections of posts.
The following article will explain the standard markup of a HubSpot blog content module, as well as describe a few simple customizations. You can see the complete markup of a standard HubSpot blog content module at the bottom of this page.
If is_listing_view statement
Standard HubSpot blog content areas are created with a master if statement that evaluates whether the user is looking at a listing or a individual post. If you are using a drag and drop template builder template, this if statement is built into the UI of blog content module buttons.

If you are coding an HTML blog template and are using a single template for both your post and listing layouts, then you need to define this if statement. Within the if statement, you will write both your post and listing code.