The Magento User Guide is here to help you through the process of setting up your store. The User Guide begins with an introduction to installing and configuring the basic settings for your store, and then walks through the steps to configure more advanced settings, setting up your payment modules, creating and editing categories and products and much more.
If you have a specific question on an element within Magento you can skip to the chapter within the User Guide using the table of contents. If you are just getting started it is best to go through the User Guide chapter by chapter to walk you through the process of configuring your store.
This User Guide is a Wiki, and as such, you should feel free to edit and add elements as you see fit.
In the next few weeks, the Magento User Guide will be available as a book in print and ebook formats.