Although one could still extend the set to a display and a few 1-wire sensors and a DHT11, but it is all this that you need for small experiments with the GPIOs. However, one should be careful to connect to the earth or the ground at the PI when you set about the Käbelchen since gone amok always in my experiments the GPIO is if I take only in the vicinity of a GPIO wire. This is true even if I touch on the ribbon cable.