Tags

Tags can be assigned to any post. One or more tags can be linked to it. This allows posts to be sorted and filtered further and assigned to specific topics. It is worth sticking to one spelling (for example plural or singular). Unlike categories, tags are optional and not hierarchical.

The difference from categories: categories organize roughly and hierarchically, while tags describe details and stand side by side on an equal footing. A post belongs to one category and carries several tags.

The most common mistake is inflation. If you create new tags for every post, you end up with dozens of archive pages containing a single entry each. Such pages are of no use to searchers and should be set to NoIndex so that they are removed from the index.

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