The real-time schedule of the buses of the public transport of Plovdiv can be seen on the virtual board (only in Bulgarian) http://transport.plovdiv.bg/desktop/ or the mobile application https://play.google.com/store/apps/details?id=com.indra.apps.pd. Tickets are sold in the buses.
The bus schedule and the bus stations can be seen also in Google maps, but there the information is according to the planned timetable and not real-time.
Taxis in Plovdiv are yellow and always have a taxi sign and a light indicator when working. There are taxi stands in front of the big hotels, train stations and bus stations, as well as in the key places in the city.
Electric scooters on rent are available in Plovdiv: https://www.li.me/en-us/home and the mobile application https://play.google.com/store/apps/details?id=com.limebike&hl=bg&gl=US
For more information about the public transport in Plovdiv: https://www.plovdiv.bg/en/item/transport/