Hand-crafted manual excerpts help visitors skim your page as they look for relevant content.
Excerpts are hand-crafted summaries of your posts which work great in your blog feed and give the user an idea about what they can find inside your full post.
By default WordPress will use the first 55 words of your article as the default excerpt— but you can do better than that! I believe in you! The first paragraph of your post likely isn’t the best description of it you could put together.
The post excerpt might be your only shot at getting someone to read your post— so it’s worth the effort.
You’ll find the meta box for your excerpt in the Document tab of the right hand column of the post editor.
If you don’t see the excerpt box, you may need to change your screen options to include it.