There are two sets of Categories that can be created, Parent Category and Child Category (Sub-Category), and the listings can be added into those categories.
HOW TO ADD CATEGORY?
STEP 1: Login to WordPress admin dashboard.
STEP 2: Go to Listings > Categories
STEP 3: Enter a Name and Slug
STEP 4: Select Parent Category if creating a Sub-Category.
STEP 5: Add Category Icon.
STEP 6: Add Category Banner.
STEP 7: Assign Category Features.
How to add icons into a Category?
OPTION 1: INSERT BASE64 IMAGE CODE
STEP 1: Go to icons8.
STEP 2: Pick an icon.
STEP 3: Click Generate HTML
STEP 4: Under the Base64 tab, copy only the code for the image src without quotes. (Example: data:image/png;base64…).
STEP 5: Paste the code directly into the Category Icon field.
OPTION 2: UPLOAD IMAGE ICON
STEP 1: Click Insert Image
STEP 2: Drop image or click Select Files to upload.
STEP 3: Click Insert into post