if you are just now getting into Arduino here is a cool and easy project for you

Step 1: What You Need

- An arduino
- a DC power supply
- a bread board
- 4 led's
- 9 jumper cables

Step 2: Step 1

Plug 4 jumper cables in the input / output ports
plug them into pins 8-11

Step 3: Step 2

plug 4 leds into your bread board make sure that you have them all the same way
ex. all the positive leads on the right and all the negative leads on the left

tip- the shorter lead on the led is the negative lead

Step 4: Step 3

plug one jumper cable into ground and plug the other end of the cable into the negative rail on your breadboard

plug all the input / output pins 8-11 into the same rail as the positive leads of your leds

Step 5: Step 4

take 4 jumper cables and plug one end into the negative rail on your bread board and the other end into the negative lead on your leds

Step 6: Step 5

you will need to copy the sketch below and paste it into your arduino software and upload it to your arduino

void setup(){
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
}
void loop(){
digitalWrite(8, HIGH);
delay(100);
digitalWrite(8, LOW);
delay(3);
digitalWrite(9, HIGH);
delay(100);
digitalWrite(9, LOW);
delay(3);
digitalWrite(10, HIGH);
delay(100);
digitalWrite(10, LOW);
delay(3);
digitalWrite(11, HIGH);
delay(100);
digitalWrite(11, LOW);
delay(3);
    digitalWrite(10, HIGH);
delay(100);
digitalWrite(10, LOW);
delay(3);
    digitalWrite(9, HIGH);
delay(100);
digitalWrite(9, LOW);
delay(3);
    digitalWrite(8, HIGH);
delay(100);
digitalWrite(8, LOW);
delay(3);
}