This is the default feature of WordPress posts and in order to create a demo like page, we need to select the post format while creating the posts. Here is an example.Follow these video guides on how to set up a gallery and video post format which can be used for other post formats as well.

Link Post Format

Create a post with title and content. Add at least one link within the post content. Select Link as a post format and publish the page. You could also use a featured image that will be displayed on the post behind the link.