How to buy BNB with bank transfer?

I'm curious, could you please elaborate on the steps involved in purchasing BNB using a bank transfer? Could you start by explaining how to set up an account on a reliable cryptocurrency exchange that supports BNB? And once the account is created, how do I go about linking my bank account to it? Also, what are the security measures I should take to ensure the safety of my transactions? Is there a specific fee structure for bank transfers? And finally, could you provide some insights on the timing of these transactions, such as when is the best time to make a purchase?