Use the "Latest Posts List" Card to display posts on your board.
You can choose between Small, Medium and Large to determine the number of items shown - this is 1, 3 and 5 items respectively.
Posts will be ordered by date, to ensure only the latest ones are shown.
Here is an example of the Medium size showing the latest 3 posts:
The full content of each post will be shown.
The post title links to a page which shows that single post. This is a permanent link to that specific post, if you want to share that on it's own.