This is a repository for major, life-altering mistakes that you or others have made. Detailed accounts of specific mistakes are welcome, and so are mentions of general classes of mistakes that people often make. If similar repositories already exist (inside or outside of LW), links are greatly appreciated.
The purpose of this repository is to collect information about serious misjudgements and mistakes in order to help people avoid similar mistakes. (I am posting this repository because I'm trying to conduct a premortem on my life and figure out what catastrophic risks may screw me over in the near or far future.)
Wizards who don't learn to interact profitably with muggles cut themselves off from most people in the world. Cutting yourself off from most people in the world is a life-altering mistake.
I'm not at all sure that avoiding high variance strategies is always a great idea.