Step 1: Power Intake
LEDs are wiered about there power intake. Most LEDs require about 3 volts any more, and they burn out and smell bad. any less, and they dont light up good. I know what you are thinking you can use a 1.5v battery such as a AA or AAA if you have a Joule Theif, but that is another instructable. As of amperage, LEDs very greatly across a wide spectrum of highs and lows, but 20mA is standard.
Step 2: Annode or Cathode?
ne is that the Cathode is shorter than the annode. the other is that the side with the cathode has a flat spot on it. Using these tricks will help you not mess up you LED related circut.
Step 3: Many Colors
There are also:
A lot more
Step 4: Connections
Step 5: Update: Resistors.
Due to popular community request, I have added a section about resistors and ohm's law.
First, resistors. Resistors are small electronic devices that limit current and/or voltage. (hence the name resistor) In "power sorce" I put a big, fat X over the 9v battery. That was wrong-ish. You can use a 9v IF and only if you have a resistor. "But what resistor should I use?" is a qestion I can hear through you computers. You have to use "Ohm's Law". Ohm's Law is a mathematical formula used to find resistence, voltage, or amperage. (it can also determen wattage, but that is a little complicated.) It states: R=V/A where "R" is resistance, "V" is voltage, and "A" is amerage. Using that, you will be able to find the proper resistor to use with you LED. (You have to do the math on your own, that way you learn)
Step 6: End