It does not matter which way round you connect the resistors.
If there are five bands, then the colours will be Orange, Orange, Black, Black, Brown. If there are four colour bands, they will be Orange, Orange, Brown, and then Gold. The colour coding will depend on how many bands are on the resistors supplied: You can identify the 330Ω resistors by the colour bands along the body. The value of a resistor is marked with coloured bands along the length of the resistor body. The measure of resistance is called the Ohm (Ω), and the larger the resistance, the more it limits the current. Resistors are a way of limiting the amount of electricity going through a circuit specifically, they limit the amount of ‘current’ that is allowed to flow. Therefore putting the resistors in the circuit will ensure that only this small current will flow and the Raspberry Pi will not be damaged. The LEDs will want to draw more, and if allowed to they will burn out the Raspberry Pi. The Raspberry Pi can only supply a small current (about 60mA). You must ALWAYS use resistors to connect LEDs up to the GPIO pins of the Raspberry Pi. If you find that they do not light in your circuit, it may be because they have been connected the wrong way round. You will not break the LEDs if you connect them the wrong way round – they will just not light. LEDs will only work if power is supplied the correct way round (i.e. The shorter leg (known as the ‘cathode’) is connected to the negative side of the power supply, known as ‘ground’.LED stands for Light Emitting Diode, and glows when electricity is passed through it. The longer leg (known as the ‘anode’), is always connected to the positive supply of the circuit. When you pick up the LED, you will notice that one leg is longer than the other. Therefore, any wire you poke into the green holes will be connected to other wires poked into the other green holes. So, for example, all the green holes marked are connected together, but they are not connected to the yellow holes, nor the purple ones. In the middle, the columns of wires are connected together with a break in the middle. The same goes for the two rows of holes at the bottom of the breadboard. And so are the second row of holes – marked with blue dots. 
With the breadboard in the CamJam EduKit, the top row of holes are all connected together – marked with red dots. The holes on the breadboard are connected in a pattern. They are often used to test a circuit design before creating a Printed Circuit Board (PCB). The breadboard is a way of connecting electronic components to each other without having to solder them together. You can get all these, and more, in the £5 CamJam EduKit from The Pi Hut, which teaches you more about LEDs, buzzers and switches, and includes all the hardware and eight well-written worksheets about using the GPIO pins on your Raspberry Pi. In addition to your Raspberry Pi running Raspbian, what you will need is:
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In this tutorial I am going to show you how to light an LED. With a little programming, you can then control them or detect what they are doing. They are the little pins sticking out of the circuit board and allow you to plug various devices into your Raspberry Pi. One of the biggest selling points of the Raspberry Pi is its GPIO, or General Purpose Input/Output ports.
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