How to buy USDC?

Could you please explain in detail how to purchase USDC? I'm new to cryptocurrencies and finance, so a step-by-step guide would be really helpful. What platform or exchange should I use? Do I need to create an account first? Are there any fees involved? How do I ensure the security of my transactions? And finally, how long does it typically take to receive the USDC after purchasing? Thank you in advance for your assistance!