How to purchase Bitcoin ATM?

Excuse me, I'm a bit confused about the process of purchasing Bitcoin through an ATM. Could you please guide me through the steps? Specifically, what are the prerequisites for making a purchase? Do I need to have a specific type of wallet or account? Are there any fees associated with the transaction? Additionally, what safety precautions should I take when using a Bitcoin ATM to ensure that my funds are secure? Thank you in advance for your assistance.