Bertho, winner of the 7400 contest with his Capacitive Sensing, the Hard Way entry, made an excellent tutorial on the use of decoupling capacitors:
While enjoying the 7400 contest, it occurred to me that many of the submitted logic designs lacked some of the most elementary safeties to ensure a working result. One of the most disregarded aspects of the designs was the lack of bypass capacitors. Then, with an article about Murphy’s law linking a Maxim application note, it was decided to write a bit about decoupling and bypass capacitors.
Via Adafruit.
Good and detailed explanations, Bertho! Bookmarked for future reference.
This made the concept “stick” – many thanks.