I'm trying to build a project (face mask detection) and its need Neural network. I want to know how to do it and what to do. and what i need to do it (libraries, tools)

[Malsa.1]

i will work with :

1- STM32F103C8 MCU code as main machine controller

2- ESP32-WROOM-32D as communication Processor for Serial, Bluetooth, and WIF

[Piranha]

If you cannot answer those questions yourself, then that task is not for you. An analogy - before landing on the Moon, you have to learn how to make at least a weather balloon first! In other words, stop listening a marketing bull$it and start learning real development:

https://www.embeddedrelated.com/showarticle/453.php