Setting up blog categories in WordPress is easy. To do this, go to your blog’s settings page and under “Posts”, click on the “Categories” tab.
You will then be able to add new categories or edit existing ones.
Once you have created a category, all of your blog posts will be automatically assigned to that category. You can also use the category filter on the Posts page to show only posts in a specific category.
To add a post to a specific category, just click on the “Add to Category” link next to that post’s title on the Posts page. WordPress will then take you to a new screen where you can enter the title of the category into which you want to add that post.