Postings are too long

All the posts on this page (https://blog.workvirtualcoach.com/) are too long. They show the entire posts, but I would only like to maybe show a paragraph and then if there is more information, I would like to have a more link to take them to see the rest of the post.

It should look like the posts on this page: https://blog.workvirtualcoach.com/?m=200906

How is that done?

Please help if anyone can.

Thanks in advance.