Ask HN: What is the best thing you learnt or got out of Hacker News?

The less-than-wildly popular posts are where the gold is. The 1000+ voted posts are usually not very interesting (but probably rage-inducing to some part of the community, for sure), but looking through a few hundred posts with a couple tens of votes each usually brings up something worth reading to the end.

I learned about AirVPN from someone here. Most of the well known VPN providers are blocked in my country, but AirVPN works like a charm.