General convention is "watch, what you're doing" 
Also, in the most cases, the red wire is connected to Vcc (+5V for example) and the black to the GND.
You can see more here: LMGTFY - Let Me Google That For You
General convention is "watch, what you're doing" Also, in the most cases, the red wire is connected to Vcc (+5V for example) and the black to the GND.
You can see more here: LMGTFY - Let Me Google That For You