Tags are a way to add an organizational structure to your WordPress posts.
Categories are basic ways for you to organize your posts into different categories, such as topics.
When writing a post, think of the wider topic of the post. If you plan to write more posts about this topic in the future, you will probably want to group these posts together.
From the post editor page, locate the "Categories box".
If you don’t have any categories yet, click the "+ Add New Category" link. Add a new category and click Add new category. You will then see your new category has been added to the list of categories.
To assign a category to a post, click the checkbox next to the category.
Another way to manage post categories is through the Posts > Categories link in the WordPress Dashboard navigation menu. Clicking the Categories link will display the Categories page. From here, you can see all your categories on the right, and where to add new ones.
The Category Slug is the URL-friendly version of the category. It is usually all lowercase and contains only letters, numbers and hyphens.
Categories, unlike tags, can be nested into hierarchies. For example, you might have a Music category, and under that have children categories for Rock and Jazz.
The description section is a place for you to add more details about the posts assigned to that category. Some WordPress themes may show this information.
What is the difference? Think of your website like a book. Categories are like the Table of Contents and tags are like the terms in the index.
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