This tutorial goes over the basics of hooking up LEDs successfully even if you have no electronics experience. To make things easy, I provided a cheat sheet for the LED, resistor and battery combinations. I also go over how to simply (no kidding!) calculate the resistor value for any low power LED so they work well and have a long life.
Here are the links to stuff I mention in the video:
Red LED link:
https://www.sparkfun.com/products/9590
Green LED link:
https://www.sparkfun.com/products/9650
Super bright blue LED link:
https://www.sparkfun.com/products/529
Resistor assortment link:
https://www.amazon.com/BOJACKValues...
Resistor calculator link:
https://www.calculator.net/resistorc...
Inexpensive DVM link:
https://www.amazon.com/MultimeterRes...