WordPress categories are very basic way to organize your post. By using category, organize post into different categories such as topics. You can add parent and child category of your post possible. The main advantages of wordpress category is that, one post can be into more than one category.
You can add any new categories at any time, but make a note of the fact that categories can be sorted in WordPress in two ways: by name (alphabetically) or by ID numbe
How to create WordPress categories
For create new category in wordpress, click ‘POST->CATEGORY’ from wordpress dashboard. Clicking the Categories link will display the Categories page
On the left side of the page you will see a tab that allows you to create categories. Fill all the field like category name, slug(will be used in the category URLs) and the Add New Category button.)
First category is ready. Let’s make a sub_category, fill in a name and slug the way you did with first category, but this time select family posts as parent for the new category. Then, press Add New Category once more to save thew new sub-category.
How to assign posts to categories
If you create the category in wordpress dashboard, you can add post to category. There are two way to add the wordpress category into wordpress post.
First method is, open a particular post or write a new one and place a checkbox in the category you want to assign it to
Second method is, bulk add posts to a category. Go to Posts -> All Posts, select the posts you want to add to a category, click on the Bulk Actions tab, select Edit and finally press the Apply button.
The posts you’ve marked previously belong to the category you’ve chosen.