How do I buy on ETH network?

Could you please explain the process of purchasing tokens or assets on the ETH network? I'm new to the cryptocurrency world and am a bit confused about the steps involved. Do I need to set up a specific wallet? Should I use an exchange platform? Are there any safety measures I should take into consideration? Also, can you provide any recommendations on how to choose a reliable and secure platform for buying on the ETH network? I'd really appreciate any guidance you can offer.