How to split a post?

Hi there… I don’t know how to get this information. So sombody in here my help me.

I would like to split a post like the latest on https://onesevenone.wordpress.com/ . It is a very long post and I would like to dispaly just the first 10 Lines on my frontpage. All the rest should appear if you click on the post.

How can I manage to do that?

Thanks!