ESP 8266 -01 is basic model WIFI module and can be interfaced with any Microcontroller to provide WiFi facility.
This video describes how to upgrade the module to AiThinker Firmware.
1MByte RAM on board , so use 1MB (8Mbit) dout .bin file for firmware.
AI THINKER Firmware
https://docs.ai-thinker.com/_media/es...
Flasher simple :
http://www.alselectro.com/files/esp82...
AT COMMANDS :
https://docs.espressif.com/projects/e...
Buy link : Base board
USB -TTL :
http://www.alselectro.com/usb-ttl-cp2...