How to buy block coin?

As a newcomer to the world of cryptocurrency, I'm curious about the process of purchasing block coins. Could you please explain in simple terms how one can buy block coins? What are the steps involved? Are there any specific platforms or exchanges that are recommended for purchasing? Additionally, are there any safety measures I should take to ensure the security of my investment? It's important for me to understand the basics before diving into this potentially lucrative but also complex market. Thank you for your guidance.