Garage Band features built-in help guides, tutorials and search features in addition to a detailed FAQ section and forum hosted by its Manufacturer, Apple. Additional assistance can be obtained via email.
Summary:
Garage Band works well for the casual hobbyist, but lacks most of the tools and features to go beyond simple editing and modification tasks. Though Apple does offer additional add-ons and upgrade features, even when accounting for those features, Garage Band is still miles behind other feature-rich, creatively-inclined, user friendly Recording Studio programs like Reason.