Amazon.com: NodeMCU ESP8266 Development Board with 0.96 Inch OLED Display, CH340 Driver, ESP-12E WiFi Wireless Module, and Micro USB Works Great for Arduino IDE/Micropython Programming (Pin Header Soldered) : Electronics
NodeMCU ESP8266 Specifications, Overview and Setting Up
How to upgrade your ESP8266 memory to 4MB (in under 2 minutes) - YouTube
Example of ESP8266 Flash File System (SPIFFS) | Circuits4you.com
Hands-On: The RISC-V ESP32-C3 Will Be Your New ESP8266 | Hackaday