Where to buy ETH from?

I'm new to the world of cryptocurrency and I'm particularly interested in Ethereum (ETH). Could you please guide me on where I can safely purchase ETH? I've heard about various exchanges and platforms but I'm not sure which one is the most reliable and secure. Additionally, I'd like to know if there are any specific steps I should follow to ensure a smooth and secure transaction. Could you also elaborate on the different payment methods available for purchasing ETH and any potential risks I should be aware of? Your insights would be greatly appreciated as I navigate this new territory.