WordPress lets you mark posts as “sticky” so they appear at the top of listings, regardless of publish date.
You can prevent sticky posts from appearing at the top of Display Posts using:
This doesn’t actually exclude sticky posts, it just prevents them from appearing at the top.
Display sticky posts
After adding the code snippet at the bottom to your site, you can list only sticky posts using:
Exclude sticky posts
After adding the code snippet at the bottom to your site, you can exclude sticky posts using: