YC published a list of themes they want to invest in:

1. Full-stack AI Companies

2. More Design Founders

3. Voice AI

4. AI for Scientific Advancement

5. AI Personal Assistant

6. Healthcare AI

7. AI Personal Tutor for Everyone

8. Software Tools To Make Robots

9. The Future of Education

10. AI Residential Security

11. Internal Agent Builder

12. AI Research Labs

13. AI Voice Assistants for Email

14. AI for Personal Finance

Of course there are many projects and startups that launched on Product Hunt in each of these categories.