Easy To Make Traffic Light Simulator For Begginers

// you can use whatever you want here it doesn't matter 
int green = 10;
int yellow = 8;
int red = 6;

void setup()
{
  pinMode(green, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(red, OUTPUT);
}

void loop()
{
  digitalWrite(green, HIGH);
  delay(20000);
  digitalWrite(yellow, HIGH);
  delay(5000);
  digitalWrite(red, HIGH);
  delay(20000);
}