18 more general topics in dewey decimal
1. Personal growth and well-being: 158.1 (Personal improvement and analysis), 204.4 (Spirituality), 613 (Personal health and safety)
2. Philosophy, religion, and ethics: 100 (Philosophy and psychology), 170 (Ethics), 200 (Religion)
3. Mathematics and science: 510 (Mathematics), 520 (Astronomy), 530 (Physics), 540 (Chemistry), 570 (Life sciences, Biology)
4. Programming and software design: 005.1 (Programming and programming languages), 006.3 (Artificial intelligence and machine learning)
5. Social dynamics and global issues: 300 (Social sciences), 320 (Political science), 330 (Economics), 361 (Social problems and social services)
6. Neuroscience and cognitive processes: 153 (Mental processes and intelligence), 612.8 (Nervous system and sensation)
7. Creativity and games: 700 (Arts and recreation), 793 (Indoor games and amusements), 794 (Indoor games of skill)
8. Communication and emotions: 153.6 (Communication psychology), 302.2 (Communication), 808.5 (Public speaking)
9. Education and interdisciplinary sciences: 370 (Education), 509 (Historical, areas, persons treatment of natural sciences)
10. Space and metaphors: 114 (Space), 809.933 (Metaphor in literature)
11. Personality and individual differences: 155.2 (Individual psychology), 616.89 (Personality disorders)
12. Writing and text analysis: 808 (Rhetoric and collections of literary texts from more than two literatures)
13. Conceptual understanding and abstraction: 121.68 (Abstraction), 160 (Logic)
14. Mindfulness and cognition: 153.7 (Perception, movement, emotions, drives), 158.12 (Meditation)
15. Online communities and interests: 004.678 (Internet), 302.23 (Media, mediated communication)
16. Representation and interpretation: 111.8 (Semiotics), 808.1 (Poetry, interpretation)
17. Time, experience, and learning: 115 (Time), 153.1 (Memory), 153.4 (Learning, memory, problem solving)
18. Holistic understanding and consciousness: 128.2 (Holism), 142.7 (Phenomenology and existentialism)