What is the largest cryptocurrency heist ever?

In the world of cryptocurrencies, the stakes are high and security breaches are always a concern. So, the question begs: what is the largest cryptocurrency heist ever recorded? This query delves into the depths of digital theft, seeking to uncover the largest and most devastating blow struck against the crypto community. Have hackers managed to pull off a heist that dwarfs all others in terms of sheer value stolen? If so, what was the method? How did they carry it out? And what lessons can we learn from this massive theft to help prevent future occurrences?