This thread is about MCUFRIEND parallel Shields
Your question is about a 3.3V Red SPI display
Please ask questions on appropriate threads.
ESP32:
connect TFT_SCK, T_SCK, SD_SCK to GPIO18
connect TFT_SDI, T_SDI, SD_MOSI to GPIO23
connect TFT_SDO, T_SDO, SD_MISO to GPIO19 (omit TFT_SDO for ILI9488)
connect TFT_RST to any GPIO pin
connect TFT_DC to any GPIO pin (sometimes called TFT_RS or TFT_A0)
connect TFT_CS to any GPIO pin
connect T_CS to any GPIO pin
connect SD_CS to any GPIO pin
ESP8266:
connect TFT_SCK, T_SCK, SD_SCK to D13
connect TFT_SDI, T_SDI, SD_MOSI to D11 (sometimes called TFT_MOSI)
connect TFT_SDO, T_SDO, SD_MISO to D12 (omit TFT_SDO for ILI9488)
connect TFT_RST to any GPIO pin
connect TFT_DC to any GPIO pin (sometimes called TFT_RS or TFT_A0)
connect TFT_CS to any GPIO pin
connect T_CS to any GPIO pin
connect SD_CS to any GPIO pin
Make sure that you configure correctly in User_Setup.h
I strongly advise to just copy Bodmer's TFT_eSPI default wiring.
Regarding Uno or Mega. This requires using level shifters. Probably too complex for you.
David.