[pmontra]

It's not one specific piece of information but how to deal with people.

In case you reply to somebody to explain why they are wrong, start a reply with a positive (nobody is 100% wrong) then tell them what you think they got wrong. It's much more effective.

Similarly, don't be snarky.

Source: observation of a zillion of threads and how they evolved in the two cases, and which ones were downvoted.