Today after opening my blog I started to dislike the fact that my posts where showing the entire text at once. I began to think that maybe if it will be shown in a summary mode it will have a nicer look. So I went to Dashboard>Settings>Reading and chose Summary
But after saving my settings it didn’t change.
I started to search related articles about this topic and found a very easy solution for this matter.
All you have to do is to insert a tag in the HTML view of your editor right in the place were you want to end the summary and hide the rest of the content.
A more detailed instruction you can find on the official WordPress page