This is the best online Arduino guide to get beginners up and running. It covers everything including what Arduino is, theory and tutorials.
This page details all the things you need for getting started with Arduino. It's an overview of simple tools and electronics components.
This is a detailed walkthrough on getting started with Arduino - a step by step guide on installing the software on Windows and Mac OSX.
The Arduino software (IDE) is where you code and upload the software for your board. Here is a low-down of what the main features are and do.
This page explains the different types of Arduino boards there are, and how to choose the best one for you.
Here we look at what an Arduino microcontroller is and what it isn't, along with a few examples of what it can do.