Preview of posts

Hi. I’d like to know how to make it so that on my home page, there is a point where my blog posts have a “_continue reading” option instead of it showing the entire post.

Basically so that each post would have a predetermined word limit where it would need to further clicked on in order to continue reading it. If no one can quite understand what I’m getting at, I’ll link to an example of what I’m talking about. If this isn’t where I would post my question, just lemme know.