To move around Buenos Aires (CABA) you have these options:
Main apps for taxis are:
All public transport work with the same prepaid card that is called SUBE. You can buy the Sube at any kiosk, no need for ID. When you buy it the card is in $0 and you have to put money on it, some kiosks have the option if not the easiest way to put money is in the metro stations.
One trip is around $30 [December 2021]
There are public bikes around the city with fix stations (they are orange). They are subscription-base and they have a “tourist” option if you dont have ID. You can check it here.
Bike path are in Como Llego app as well.