How do I buy from CoinMarketCap?

Excuse me, could you please explain the process of purchasing cryptocurrencies through CoinMarketCap? I'm new to this and a bit unsure of how to navigate the platform. Is there a specific step-by-step guide that I should follow to ensure a smooth transaction? Also, are there any safety precautions I should be aware of when making a purchase on CoinMarketCap? Your guidance would be greatly appreciated.