Are you committing any of the Seven Deadly Sins of Poker? https://www.pokernews.com/strategy/seven-deadly-sins-of-poker-how-many-are-you-guilty-of-26565.htm
What should you do if you suspect cheating in your poker game? https://www.pokernews.com/strategy/suspect-cheating-in-a-poker-game-heres-what-to-do-about-it-26458.htm
If you make a bad call, don't compound the error with a bad justification of it. https://www.pokernews.com/strategy/two-things-you-should-never-say-at-a-poker-table-26465.htm
This one is about the psychology of the "near-miss" phenomenon in gambling generally, and in poker specifically. https://www.pokernews.com/strategy/no-cigar-how-to-exploit-the-psychology-of-the-near-miss-26408.htm