I got a copy of Arduino from a local retailer here (it's a local copy and I'm pretty confused with how the pins actually work).
I know basic electronics so far, there should be two pins for every node one acting as the negative terminal and other as the positive terminal. If I were to connect an LED with my Arduino board which pins would I be utilizing?
Here let me tell you how pins are arranged on mine:
IOREF GND
13
RESET 12
3.3V //this left group marked power .
5V //right group marked PWM 2
GND //right groupmarked communication TX0 -1
GND RX0- 0
V1N TX3-14
RX2 -15
A0 ..
A1 SCL -21
.. //THIS left GROUP MARKED ANALOG IN
A7
A8
A9 //I believe it is part of the above group
..
A14
A15
//the pins below marked DIGITAL
52-50-`48-46...........................................................22`