How to write drivers for a usb device?

Question

Do it yourself

I'm trying to make a device consisting of:
usb dongle, which receives a signal from another device.
At certain events on the computer into which the usb dongle is plugged in, keystrokes should be "transmitted" / occur.
How to implement correctly? Should I write my own driver or can I somehow make the dongle look like a keyboard?
In which direction to dig? What to read? What to google?

Answer 1

Your USB crap should emulate a keyboard. USB HID is your salvation. And you don't need any drivers. Google USB HID class.

Answer 2

like in the hacker magazine there was an article about something like that