How do I buy Web3?

Hello there, I'm curious about purchasing Web3 and wanted to know the process. Could you please guide me through the steps involved in buying Web3? Is there a specific platform or exchange that I should use? Also, are there any specific requirements or prerequisites that I need to fulfill before I can make a purchase? I'm a beginner in this field, so I would really appreciate it if you could explain the process in simple terms. Thank you in advance for your help!