motor – Arduino not reacting generally when studying serial instructions

When I’m sending hex numbers through laptop to the arduino leonardo, it generally will not react, however the serial monitor says that it was despatched. My code;

    void setup()
{
  Serial.start(9600);
  pinMode(9, OUTPUT);
  pinMode(A0, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
}

void loop()
{
  delay(100); // Anticipate 100 millisecond(s)
  Serial.println(Serial.learn());
  if (Serial.learn() == 49) {
    Serial.println("left");
    analogWrite(9, 1023);
    digitalWrite(A0, HIGH);
    analogWrite(10, 1023);
    digitalWrite(11, LOW);
  }
  if (Serial.learn() == 50) {
    Serial.println("proper");
    analogWrite(9, 1023);
    digitalWrite(A0, HIGH);
    analogWrite(10, 1023);
    digitalWrite(11, LOW);
  }
  if (Serial.learn() == 51) {
    Serial.println("backwards");
    analogWrite(9, 1023);
    digitalWrite(A0, LOW);
    analogWrite(10, 1023);
    digitalWrite(11, LOW);
  }
  if (Serial.learn() == 52) {
    Serial.println("forwards");
    analogWrite(9, 1023);
    digitalWrite(A0, HIGH);
    analogWrite(10, 1023);
    digitalWrite(11, HIGH);
  }
  if (Serial.learn() == 48) {
    Serial.println("cease");
    analogWrite(9, 0);
    digitalWrite(A0, LOW);
    analogWrite(10, 0);
    digitalWrite(11, LOW);
  }
}

After I ship the numbers 1,2,3,4, and 0, it reads what the command does. Pins A0 and D11 are route management for the motor controller, and pins D9 and D10 are velocity.

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