Getting Around Dubai is quite easy with several options like Dubai Metro, RTA Buses, RTA Cab, Uber, and Careem but if you want to travel one in public transport I recommend obtaining NOL Card from any Dubai Metro Station. It will cost you 25 AED having 19 AED Travelling balance in it.
Dubai Metro is divided into 3 parts for 1st part it will cost you 3 AED and if you travel 2 parts it will cost you 5 AED and if you travel 3 parts it will cost you 7 AED.
Nol Card can be used in the Dubai Metro and also in RTA Buses.