Arduino- how to light the LED?

Elementary lighting

int ledPin = 13; // LED connected to digital pin 13
void setup()
{
    
 pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop()
{
    
 digitalWrite(ledPin, HIGH); // sets the LED on
 delay(1000); // waits for a second
 digitalWrite(ledPin, LOW); // sets the LED off
 delay(1000); // waits for a second
}

Advanced lighting

1> Light a light , Execute other code again

int ledPin = 13; // LED connected to digital pin 13
int value = LOW; // previous value of the LED
long previousMillis = 0; // will store last time LED was updated Last activation time 
long interval = 1000; // interval at which to blink (milliseconds) interval 
void setup()
{
    
     pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop()
{
    
	// here is where you'd put code that needs to be running all the time.
    
	// check to see if it's time to blink the LED; that is, is the difference
	// between the current time and last time we blinked the LED bigger than
	// the interval at which we want to blink the LED.
    if (millis() - previousMillis > interval) {
    
    	previousMillis = millis(); // remember the last time we blinked the LED
		// if the LED is off turn it on and vice-versa.
        if (value == LOW)
        	value = HIGH;
        else
            value = LOW;
		digitalWrite(ledPin, value);
    }
}

2> Button lighting

int ledPin = 13; // choose the pin for the LED
int inPin = 2; // choose the input pin (for a pushbutton)
int val = 0; // variable for reading the pin status
void setup() {
    
	pinMode(ledPin, OUTPUT); // declare LED as output
	pinMode(inPin, INPUT); // declare pushbutton as input
}
void loop(){
    
    val = digitalRead(inPin); // read input value
 	if (val == HIGH) {
     // check if the input is HIGH (button released)
 		digitalWrite(ledPin, LOW); // turn LED OFF
 	} else {
    
 		digitalWrite(ledPin, HIGH); // turn LED ON
	}
}