Before getting started, make sure you have:

• A Wi-Fi router (2.4GHz only, ESP8266 does not support 5GHz)
• Your network SSID (Wi-Fi name)
• Your password

#include <ESP8266WiFi.h>

const char* ssid = "YOUR_WIFI_SSID";     // Replace with your network name
const char* password = "YOUR_WIFI_PASS"; // Replace with your network password

void setup() {
  Serial.begin(115200);
  Serial.println();

  Serial.printf("Connecting to %s\n", ssid);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nConnected to Wi-Fi!");
  Serial.printf("IP Address: %s\n", WiFi.localIP().toString().c_str());
}

void loop() {
  
}

Expected Output

If everything works correctly, you should see something like:

Connecting to MyWiFi
.......
Connected to Wi-Fi!
IP Address: 192.168.1.45