Recommended · for some experience
SparkFun Engineering Roundtable 11-12-12: HID and USB Devices with Chris Taylor
Why people recommend it
A SparkFun video suggested as a first stop when making an Arduino act as a USB keyboard or other HID device, with links to further resources.
Watch for: Depends on which Arduino board and USB chip you have
In their words
I found this video on youtube where it is mentioned that the first byte is used as modifier byte, 2nd byte is reserved and remaining 6 bytes are used for key presses.
G-aura-V on electronics.stackexchange.com, Sept 2020. CC BY-SA.