The safety tag is for the well-being of the people and objects around you, and yourself.

**Some general precautions for your Arduino:**

 - Don't under/over power your Arduino
 - Don't pull more than 40 mA on most boards from one digital pin
 - Don't apply more than 5V to any pin (except VIN)
 - Don't change a circuit while the Arduino is powered

**Some general precautions for you/the people around you:**

 - Don't apply mains to your Arduino.
 - When powering high voltages with a relay, make sure to cover and seal any wires that might be connected to the high voltages.
 - Arduino not to be used as a flotation device. Really, don't get your Arduino or any other part of your setup wet.