Learn the ESP32 by building real things.

1// Blink: the first sketch on any new board
2const int LED_PIN = 2;  // check your board's LED pin
3 
4void setup() {
5  pinMode(LED_PIN, OUTPUT);
6  Serial.begin(115200);
7}
8 
9void loop() {
10  digitalWrite(LED_PIN, !digitalRead(LED_PIN));
11  Serial.println("tick");
12  delay(500);
13}