How do I know the name of my ESP32 module in the Arduino Board Manager?

Hi

Recently, I have bought a new Esp 32 38pins from Aliexpress

I don't know which module should I use from the Arduino IDE Board Manager. However, I tried blink sketch with several board modules such as (Node32s, Esp32 Dev Module, Esp32 Wrover Module) and somehow it worked. Which one should I use?

Also, What are the pins that are free to use? ( Not connected to the flash memory chip ), What are the restrictions of the pins? Is there any pin diagram of the 38 pins?

Finally, Is there any good documentation you would recommend for beginners?

There was a good one for esp8266. here

Please Help.

Is the one you should highly consider using.

ESP32 API contains the answers to your questions.