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Related Posts
When the latest posts from the same category are enough, when YARPP or Jetpack Related Posts can help, and when a site needs its own rules for which posts to recommend.
Start with the simple version
The simplest setup shows the latest three posts from the same category. For a small site with clean categories and regular publishing, that may be all you need.
It stops working when categories are too broad, when your content serves more than one audience, or when an older evergreen post should outrank a newer one that is less relevant.
Plugins solve part of the problem
YARPP and Jetpack Related Posts can help, especially when you want recommendations running quickly without building editorial tools.
Still, check what the plugin actually recommends against what you want readers to find. Related posts decide where readers go next, so review them the way you would review any other navigation.
When to write your own rules
A custom system can combine categories, tags, hand-picked posts, recency, priority, and exclusions. That is worth building when related posts steer people toward signing up, through a resource library, or to support answers.
Whatever you choose, it should make your editors' decisions easier. It should not become one more algorithm nobody can explain.