- Literature: Includes guides to classic literature, contemporary novels, and popular young adult books
- History: Guides to major historical events and periods
- Math: Guides to algebra, geometry, calculus, and other math topics
- Science: Guides to biology, chemistry, physics, and other science topics
- Philosophy: Guides to major philosophers and philosophical concepts
- Economics: Guides to microeconomics, macroeconomics, and international economics
- Psychology: Guides to different psychology topics
- Sociology: Guides to different sociology topics
- Art history: Guides to major artists and art movements
- Music history: Guides to major composers and musical periods