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  1. ESP8266 - Wikipedia

  2. ESP8266 Wi-Fi SoC | Espressif Systems

  3. Getting Started with ESP8266 NodeMCU Development Board

  4. Getting Started With ESP8266: A Beginner's Guide - Last Minute …

  5. Installing ESP8266 Board in Arduino IDE (Windows, Mac OS X, Linux)

  6. 150+ ESP8266 NodeMCU Projects, Tutorials and Guides with …

  7. GitHub - esp8266/Arduino: ESP8266 core for Arduino

  8. ESP8266 Wi-Fi tutorial and examples using the Arduino IDE

  9. Getting Started With the ESP8266 ESP-01 - Instructables