Light
[light]
[light] section defines lights of the keyboard, aka capslock, scrolllock and numslock. They are actually an input pin, so there are two fields available: pin and low_active.
pin field is just like IO pins in [matrix], low_active defines whether the light low-active or high-active(true means low-active).
You can safely ignore any of them, or the whole [light] section if you don't need them.
[light]
capslock = { pin = "PIN_0", low_active = true }
scrolllock = { pin = "PIN_1", low_active = true }
numslock= { pin = "PIN_2", low_active = true }