The FAA maintains the Pilot's Handbook and the Powered Parachute Handbook to aid in flight training. The USHPA has compiled a list of some of the most relevant topics and chapters from the handbooks for hang gliding and paragliding student pilots. Read more
A number of textbooks explain everything from the basics of hang gliding and paragliding to the weather, cross-country flying, towing, and more. Here's a list to get started