Give your ESP8266 a internet connection by connecting it with your wifi router.

Blog_ESp8266_STA or wifi connection.ino

/*     
 OUTCOME: Connecting your ESP8266 to any Wifi NETWORK(Mobile Hotspot,Home Route)
 Author: Ankit Rana (Futechiot)
 Board Used: Wemos d1 mini, Wemos d1 mini pro, Node MCU
 
 Website: www.futechiot.com
 GitHub: https://github.com/futechiot 
 
 Rrsource:
 Advanced IP Scanner: https://www.advanced-ip-scanner.com/

 -->download and open this application
 -->Scan for networks, make sure your PC and board are connected in same network
 -->search for obtained IP, see in manufracturer "ESPRESSIF"
 
 */


#include <ESP8266WiFi.h>               //Wifi library of esp8266 to access HARDWARRE APIS and othe functionality

/* Set these to your Wifi credentials. */

const char* ssid = "SSID-OF-YOUR-HOTSPOT";                  // SSID of your Router OR mobile hotspot 
const char* password = "PASSWORD OF YOUR HOTSPOT";                         //  PASSWORD of your Router or Mobile hotspot see below example 

void setup() {
  
// put your setup code here, to run once:

Serial.begin(115200);       // to enable Serial Commmunication with connected esp8266 board
delay(500);
WiFi.mode(WIFI_STA);       // changing ESP9266 wifi mode to STATION

Serial.println("");
Serial.println("");

Serial.println("connecting to :");
Serial.println(ssid);
Serial.println(WiFi.hostname());          

WiFi.begin(ssid, password);                  // to tell ESP8266 Where to connect and trying to connect
  while (WiFi.status() != WL_CONNECTED) {   // While loop for checking Internet Connected or not 
    delay(500);
    Serial.print(".");
  }
  
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());            // successful Connection of ESP8266, 
                                            // printing Local IP given by your Router or Mobile Hotspot, 
                                            // Esp8266 connect at this IP
                                                 
  Serial.println("");
  Serial.println("Download and Open Advanced IP scanner application given in description to see board is connected (you can see Espressif inc iin manufracturer");
                                            
}

void loop() {
  // put your main code here, to run repeatedly:

}