Default WordPress Category for blog Posts is improved with new options. To add new or find your created Categories, navigate to Posts > Categories via main WordPress menu.
For each Category can be defined name (title), parent of Category if you are creating parent-child hierarchy of Categories and also description text which can tell more about created Category in short.
In addition, available are options to define Category Icon and Color. With these information is Category represented on the frontend of website. For example Posts displayed on map which are assigned to the same category are represented on the map with marker colored by Category color and Icon defined for this Category.
Created Categories are available in Posts Search Form block to search through posts by specified Category.