Ask HN: What is the best single hack that you've gotten out of Hacker News?

For me it would be meticulously documenting all I do in my project. It's enabled me to minimize the binge nature seemingly inherent in coding and make steady (even if slow) progress on my 'big project.' While it doesn't come natural to me it enables me to do something substantial, even if small, every day. What's the best single thing you've gotten out of HN?