This discussion is about writing closely related posts and interlinking them so as to keep the readers stick to your site. So in a way it’s about reducing your bounce rate. There are lots of ways to do that I guess, but we are dealing with BASE POSTS
Sticky posts are those posts that actually stick to the home page. Usually when new posts are added the older ones are taken down automatically, but not with sticky posts. A post once made sticky will stick to the top of the posts, i.e. it will be the first post no matter how many posts are posted after that.