How do you buy on PancakeSwap?

As a crypto enthusiast, I'm curious about the process of purchasing tokens on PancakeSwap. Could you please elaborate on the steps involved? Specifically, how do I connect my wallet to the platform? Do I need to have a specific type of cryptocurrency to make a trade? Additionally, what are the transaction fees like, and how can I ensure my transaction is secure? Understanding the intricacies of this decentralized exchange would greatly enhance my crypto trading experience.