I'm wondering, could you please provide some guidance on where exactly I can purchase coins on Coinbase? I've heard of this platform before but I'm not entirely sure of the exact steps I need to take to make a purchase. I'm particularly interested in some of the popular cryptocurrencies that are available on the platform. Would you mind walking me through the process, step by step, so I can make an informed decision and complete my transaction smoothly? Thank you in advance for your help!