Making a Blog
Latest Posts
This block will a list of your site’s most recent posts within a page of your choice. The Latest Posts block provides options for thumbnails, excerpt length, and allows you to choose exactly which posts appear based on their categories.
In a new block, type /latest and select “Latest Posts”

The editor on the right sidebar allows you to configure the display of the list. For example, you can choose how much excerpt to display (if any) and how large the thumbnails should be (if displayed at all).