I’ve learned and am still learning some important lessons about HDMI cables as a school technology director. Unlike older VGA cables used with many classroom projectors in the past, HDMI cables can carry both video AND audio signals. VGA cables required the use of a separate (usally 1/8th inch) audio cable when playing videos or other multimedia with sound from a laptop computer or other computing device. The transition to HDMI-based classroom projection options is an ongoing journey for us…