The Foundations section gives you some specific knowledge about the principles and techniques that are behind the Arduino platform,
its whole family of boards and the software you use to tell your boards what to do.
If you want to get some knowledge before you start using things, this is the right place.
If you want to jump on tinkering with your board visit the Getting Started page.
Do you want to develop further the Arduino Hardware, or just build an Arduino on a breadboard? Check out the Hacking section.
Looking for help on how to extend the Arduino Software (IDE), like write your own Library? Check out the Hacking section.
Visit the ITP Physical Computing site for more resources on learning the basics of Electronics, Sensors, Serial Communication, Motors and more.