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Arduino is a powerful microcontroller that easily interfaces with electronic hardware.
Plug in the Arduino through USB.
Load up the blink example.
Choose the serial port and press the upload button.
Now disconnect the computer from the arduino to prevent damage to the circuit while constructing it.
Connect a wire from the ground (on the left of the arduino board) to the positive rail (on the breadboard).
Connect a wire from the 5 Volt supply (on the left of the arduino board) to the negative rail (on the breadboard).
Connect a resistor from the positive rail onto any space in the breadboard.
Connect the LED by inserting the long end into a space in the same row as the resistor, but the short end in a space in a different row from the resistor.
Now connect a wire from a space in the same row as the short end to pin 13 (on the right of the arduino board).
Plug it back into the computer in order to power the board.
If you did this right, the LED should light up.