Пост в Istanbul, Istanbul Province, Republic of Türkiye

You can use the bus for Taksim and Kadıköy location.

there is HAVABUS (buses) at the basement ground goes the city center wherever you wanna go.

Fint bus bro it name is "Havaist-14" it is in the transportation floor With it you can go taksim it is 30 Turkish lira

Go down the ground 0 of airport and then use havaist buses to many locations as want. You can pay by credit card in the bus, it cost 30 tl to every point.