We Create Post for filter your Post project(s) on Post page.
For Post category Add / view / edit / quick edit / trash Your Post Please go to Post Category under Post in admin panel.
For add Post Category please enter your Post category name[3] , Post category slug[4], Parent of [5] , Post category description [6] in post left side box [2].
For Publish your category live on website, click on Add New Category [7].
**If you want to add and save only your Post(s), not want to publish , then In all category section[7] you can use quick edit option.