Burada yazana göre birde 3.3V-5V convertere ihtiyacım varmış birde onu nasıl bağlayacağım https://forum.arduino.cc/t/connect-...rduino-mega-without-shield-wih-jumpers/626298
Those screens need 3.3V - 5V voltage converters. They are 3.3V devices that cannot work on 5V boards when connecting directly. If you do it that way in the MEGA, you run the risk of damaging your screen.
If you want to connect it directly without using a shield, you should connect it in an arduino Due, for example