You have to do more self-research. SD on ESP32 is not easy, but it can be done.
There are many many SD memories that cannot be used.

No, I will not elaborate.

The example/SD just define 3 pins, and I didn't find any where mentioned SD_CS, can be a problem?

I used SD card reader with 6 pins.

What exact board do you have?

Thanks.
I have T-Display S3 basic + SD card.
I heard that the Touch version more difficulty to work with SD?

Thanks for the heads up Terry, I just had my T-Display-S3 Touch delivered on Friday, I will be jumping on it very soon, I need to resolve an issue with the none touch unit....I posted that topic tonight.

Thank you again.

I noticed that in the pinout the SPI pins 10-13 are also connected to some of the touch pins ?

I'm still waiting on my device to arrive but I hope there is no issue there.

Thank you.

pinMode(SD_CS,OUTPUT);

so the complete code-part looks like this:

void setup() {

  Serial.begin(9600);

  spiSD.begin(SD_CLK, SD_MISO, SD_MOSI, SD_CS);  //SCK,MISO,MOSI,cs
  pinMode(SD_CS,OUTPUT);

  if (!SD.begin(SD_CS, spiSD, SDSPEED)) {
    Serial.println("Card Mount Failed!");
    return;
  } else {
    Serial.println("Card Mount Successful!");
  }
}