Summary Block - List Display
This page has a couple of Summary Blocks, using the List display type. You can choose which elements to show, the size of the text, the size and shape of the images, and their position. Using Summary Block with List display is a great alternative to your template's normal default Blog index.
This is a blog post excerpt, which is showing instead of the full body text of the post. This post also has a thumbnail image associated with it. In this template, if you set both of these, then they will both show on the main Blog Page.
This is a Squarespace Blog post with a location attached to the post. Some templates show the location as a map link. This one does, and you can see that location link below.
This blog post has a full-width image at the top of the post. Sometimes this can mean lots of scrolling before you see content. It also has a video in it, too.
This post shows the different ways you can crop images in Squarespace.
Here's an example of how you can use a Summary Block to show a Related Posts list at the bottom of your blog posts.