human
What are the most common questions that people ask on a question and answer site?
assistant
The most common questions that people ask on a question and answer site include: 
1. How to do X? 
2. What is the best way to Y? 
3. Why did Z happen? 
4. Is there any evidence for A? 
5. Are there any resources I can use to learn more about B? 
6. What are the pros and cons of C?