- Official Arduino site, https://www.arduino.cc/
- 16 Hertz, http://www.16hertz.com/
- Purchase cheaper non-official kits.
- Great graphic novel style intro book, Illustrated Arduino
- SparkFun, https://www.sparkfun.com/
- Starter kits and SIK Experiment Guide for Arduino book.
- Adafruit, https://www.adafruit.com/
- good source for purchasing electronics, including specialized Arduino based boards and accessories.
- lots of projects and learning resources.