This video shows from hardware getting ready to Arduino IDE programming how-to set up a standalone  (access point, AP) web server on a ESP8266 module hosting a web page to control remotely a servo via WiFi.

In this use case, the objective is to turn on and off the button of a flashlight ona drone via a smartphone or a tablet. See video here:

A ESP8266 ESP-07 model is used for its external antenna capability (better range than integrated PCB antennas).

Cheers,
Hugues