How do I pay for Chainlink?

I'm a bit perplexed about purchasing Chainlink. Could you please clarify the process for me? I'm not very familiar with cryptocurrency exchanges and would appreciate it if you could guide me through the steps. Do I need to create an account on a specific platform? Are there any fees involved? And what about the security measures? I want to make sure my transactions are safe and secure. Could you also tell me about the different payment methods available for Chainlink? I'm open to exploring all options that ensure a smooth and hassle-free purchase experience.