There are plenty of cheap ways to get around Atlanta. But the leading transportation means are provided by Marta, the city’s primary bus and train operator. Atlanta Streetcar is also available, but it only drives around selected landmarks and stops. If you have the budget for it, car rentals are also available. Taking taxis is extremely impractical since most of the time, the meter will be running while the traffic is barely moving.
The wisest option is to walk around or rent a bike if the places you want to visit are within close distance. And opt for the buses and trains for long-distance rides.