ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
GitHub - kiranshashiny/Wemos-D1-mini-Blink-LED: This is my first blog on WEMOS D1 mini, and what were the various parameters like board manager etc are listed here.
WeMos D1 mini (esp8266), pinout, specs and IDE configuration – Part 1 – Renzo Mischianti