Before you start to mess with a computer there are basic guidelines to be aware of, such as turn the power off and watch out for static electricity. What guidelines should I be aware of when I work with an Arduino board if I don't want to harm neither myself nor the board. The three kind of activity that requires touching the Arduino and what I'm asking about:

• Setting up wire, component layout or breadboard.
• Debugging a running setup.
• Moving, mounting up the board somewhere.