Blink
The quintessential project
The 'hello world' of embedded projects is to get an LED to blink
Links for more info:
github for esp-idf: https://docs.espressif.com/projects/esp-idf/en/stable/esp32/index.html
docs: https://docs.espressif.com/
in depth video on esp-idf: https://www.youtube.com/watch?v=J8zc8mMNKtc