Hello! You are probably reading this Instructable because you have just bought an Arduino and you want to setup your first project. So follow these steps and you will learn more...
Step 1: What You Will Need
You will need: an LED, an Arduino Uno and an Arduino USB cable.
Step 2: Plugs 'n' Stuff
In this step we will plug all the wires together. So first plug the long leg of the LED into the pin labelled "13" on the Arduino, then plug the shorter leg of the LED into into the pin labelled "GND". Now all you have to do is plug the Arduino into your Computer.
Step 3: The Code
Do not worry, we are almost done! Lets now program the Arduino, to do this we will: open the Arduino IDE, click on Files, then Examples, then Basics and finally click on Blink. Something like this should come up. Now all you have to do is click the upload button (the one that's a blue horizontal arrow).
Step 4: Finshed!
Well done, you have made your first Arduino project (a blinking led) with great success! Now you have discovered the world of Arduino, your imagination is the limit!