olx template

Hello
In categories block ( categories carousel ) on home page
how and why this 16 categories
how build it or delete or add new category

As I correct understand you can do it via Admin Panel >> Categories.

Thanks for answering
But i mean this block choose parent category or what?

Thanks for answering
But i mean this block choose parent category or what?
How can i assign a specific category?

Nope, the block show all active categories from 1 listing type type. You cannot show or hide some categories in the box.