Ask HN: Best tactics for product feedback and when is enough enough?

Hey everyone, we all know how important it is to gather feedback on our projects and ideas. But how do you go about doing it? And how do you know when you've gathered enough feedback to move forward with your plans?

I'd love to hear about your strategies for gathering feedback, whether you use online surveys, focus groups, or other research methods. Do you rely on personal connections and informal conversations, or do you seek out more structured feedback sessions? And how many people do you typically need to engage with before you feel confident in the feedback you're receiving?

As a reference, YC partners have written some popular blog posts on the topic of customer feedback, such as "How to Get Startup Ideas" by Paul Graham and "How to Talk to Users" by Adora Cheung. Have you found these posts helpful in your own feedback-gathering process?