How to instantly buy Solana?

Could you please explain how I can purchase Solana instantly? I'm a bit unfamiliar with the process and would appreciate a step-by-step guide. Is there a specific platform or exchange that offers quick and secure transactions? Additionally, what are the fees associated with instant purchases? Is there a minimum amount required, or can I buy any quantity I want? Also, are there any security measures I should take while making the purchase to ensure my funds are safe? Thank you for your assistance in navigating this process.