Hi.
ESP-NOW is not included in the ESP32 course, because we’ve just started exploring ESP-NOW a few weeks ago.
However, you can follow our free guides about ESPNOW on the following links:
https://randomnerdtutorials.com/esp-now-two-way-communication-esp32/
https://randomnerdtutorials.com/esp-now-esp32-arduino-ide/
I hope this helps.
Regards.
Sara