How do I buy large sums of crypto?

Could you elaborate on the steps involved in purchasing large sums of cryptocurrency? I'm particularly interested in understanding the safety measures I should take, the platforms or exchanges that cater to high-volume transactions, and any specific considerations for managing the risks associated with such investments. Additionally, I'd like to know about the most efficient way to transfer funds securely into the crypto market and any strategies for diversifying my holdings. Your expertise in this field would be greatly appreciated.