I have my lights connected to a GFCI and other than that I don't take any special precautions and haven't for at least the past ten years, without any problems.

Having said that my father in law covers every single connection with something, a bag, an upside down bowl, or bucket, or some other method.

His lights in the front are on a GFCI and his lights in the back are not.

What *should* be done for proper Christmas light safety and why.