This is D1 mini, a mini WiFi board based on ESP-8266EX. How to start using Ar duino? Please read the document carefully. The document link is
MakerFocus 2pcs ESP8266 NodeMCU LUA CH340 ESP-12E Internet WiFi Develo
Arduino D1 Mini V2 NodeMcu 4M Bytes Lua WIFI Internet Development Boar
MakerFocus 2pcs ESP8266 NodeMCU LUA CH340 ESP-12E Internet WiFi Develo
Start Using Wemos D1 Mini NodeMCU WiFi ESP8266 module with Arduino
Type-C ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (10pcs Type-C) : Electronics
ACEIRMC ESP8266 NodeMCU LUA CP2102 ESP-12E Internet WiFi Development Board Open Source Serial Wireless Module Internet for Arduino IDE Micropython (6pcs) : Electronics
ACEIRMC 6pcs ESP8266 D1 Mini WiFi Dev Board ESP-12 ESP-12F NodeMcu Mini Module for WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino : Electronics
Description:ESP8266,ESP-12FWIFI Development Board4M bytesThis is D1 mini, it is a mini WIFI board based on ESP-8266EX.11 digital input/output pins,
Makerfocus D1 Mini NodeMcu 4M Bytes Lua WiFi Development Board Base on ESP8266 ESP-12F
Cheap ESP8266 Microcontroller Development Board Module WiFi Function Open Source Hardware – MakerFocus
11 digital input / output pins, all pins with interrupt / PWM / I2C / support 1 line (except D0); 1 analog input(3.2V max input). Micro USB
6pcs ESP8266 D1 Mini WiFi Dev Board ESP-12 ESP-12F NodeMcu Mini Module for WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266
Start Using Wemos D1 Mini NodeMCU WiFi ESP8266 module with Arduino