Installing ESP8266 Board in the Arduino IDE: Step-by-Step Guide
How to Program an ESP8266 ESP-01 with an Arduino Nano · { George_Vlahavas }
Amazon.com: HiLetgo 1PC ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Small) : Electronics
How to make ESP8266 work as an Arduino board « osoyoo.com