This is a quick summary of how to work with the "AdvancedWebServer" example sketch.
The environment
OS: Windows 8.1
Arduino IDE Version: 1.8.4 / 1.8.1
ESP8266 Module: NodeMCU v1.0
Prepare the sketch
1. Load the "AdvancedWebServer" sketch into Arduino IDE.
The sketch is located under "File" -> "Examples" -> "Examples for NodeMCU 1.0 (ESP-12E Module)" -> "ESP8266WebServer".