If you're using a Breadboard you can pin these into it and connect up your servo using the below diagram. Otherwise: G (Ground) will go to the Brown / Black pin of the servo. 3V3 (3 Volts) will go to ...

So, connect TX of ESP8266 to Pin 2 of Arduino and RX of ESP8266 to Pin 3. Since, ESP8266 cannot tolerate 5V, the TX of Arduino (pin 3) is first level shifted using two resistors (1 KΩ and 2.2 KΩ) and ...