My Arduino Nano clone doesn't show in the serial this simple code. Why? Here is the code:

void setup() {
  Serial.print("hi");
}
void loop() {
}


The product is in here.

I also installed the drivers.
You haven't "started" the serial interface.  Before you use the serial you need to tell it to initialize the hardware and how fast you want to communicate.

You need to add, for instance,

Serial.begin(9600);


to your setup() function before you do your Serial.print().