This is the default template on your site. That means that when you create a new navigation term, it will automatically use this template. This template will work for 90% of the content of your site.
The “Post” post type is the default post type on your site. The majority of your content will most likely use the “Post” post type. Use this post type unless your content fits into a more specific category that fits in with another type.
This post goes through examples of how to use the advanced classes library to display images, block quotes, and other content different. The example text is taken from Kafka’s Metamorphosis.
Photo galleries are recommended when images are the main content of your post. When you use the photo gallery post type, the images added to the post will automatically display in a gallery format.