How did Sam Bankman-Fried lose so much money?

I'm genuinely curious about how Sam Bankman-Fried managed to lose such a staggering amount of money. Was it a series of poor decisions? Did he underestimate the risks involved in his trading strategies? Or was it a combination of both? Given his reputation as a rising star in the cryptocurrency world, it's baffling to see how quickly things have turned for him. Could you please elaborate on the specific reasons behind his losses? I'm eager to what understand went wrong and how it could have been prevented.