How to assign posts to categories

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After creating category structure, add posts by writing new or opening an old post. Now place a checkbox in the category for assignment. You can also add bulk posts to the category by going to ‘Posts, ‘All Posts’, now select posts for adding to the category, click ‘Bulk Actions’, ‘Edit’, press ‘Apply’ button. Edit settings for selected posts and ‘Categories’, select category for adding a post, now click ‘Update’.