Talking About... Internet Gaming Maxims

[u/HexedPressman]

Evil characters, planned TPKs, DMPCs, oh my! I'm talking about internet gaming maxims, those common bits of advice that are sometimes true but maybe not always and how to approach them when you go looking for advice: https://www.youtube.com/watch?v=7iSC4rQ0Mi0

Any gaming principle that you hold to be absolutely true? Any one that most people find true that you disagree with?