I am a self-taught investor who started investing a few years ago. From blindly investing in real estate, hedge funds, and exotic investments (like art) to having two investment managers manage my assets, I think I have seen a lot (but probably not enough). I have seen my portfolio gain 70% in a year to catastrophic losses. I have seen the COVID boom and inflation bust. These experiences have led me to form my investing principles:
It is more important to not lose money than to make money.
Good decisions can make you lose money in the short term, but in the long term, you are more likely to make money on them.
To make good decisions, you need intellectual curiosity and emotional fortitude.

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self-taught, full time investor