How to change the page/post summary or excerpt

The excerpt is the little text snippet that shows under post titles in a blog feed. See more information here.

It is usually auto generated by WordPress, but you can explicitly specify it yourself as well:

Enter manually using the Excerpt field
Specify using the

Use the "Excerpt" Field

In order to explicitly specify an excerpt for a post or a page, go to the page/post edit screen. Click on “Screen Options” in the top right.

It would open a ‘drawer’ like the following. Make sure “Excerpt” is checked.

Now scroll down to see the “Excerpt” field – it should be after the content editor. Whatever you enter in here will be shown on the home page and any place where the post/page excerpts are being displayed.

Here is a video showing how to set your own excerpts:

Using the More Tag

You can truncate your blog posts so that only a part of a posts is displayed on homepage, archive pages and in subscriber emails. When you do this, a link will be placed directly after your excerpt, pointing the reader to the full post. You can put this link anywhere in a post, and customize it to say whatever you want.

More details here and here.