How do I buy decentralized crypto?

Hello there, I'm curious about the process of buying decentralized cryptocurrencies. Can you please walk me through the steps involved in making such a purchase? Are there any specific platforms or exchanges that are recommended for beginners looking to get started in the world of decentralized crypto? Additionally, are there any safety precautions or tips I should keep in mind while making a purchase to ensure a smooth and secure transaction? I'd appreciate any insights or guidance you can offer on this topic.