How to buy Pendle on MetaMask?

How do I navigate the process of purchasing Pendle tokens using MetaMask? Could you provide a step-by-step guide? I'm familiar with MetaMask as a wallet, but I'm new to buying cryptocurrencies on it. Would I need to connect to a decentralized exchange first? Are there any specific fees or considerations I should be aware of? Additionally, what are the security measures I should take to ensure a safe and secure transaction? I'd appreciate any tips or insights you could share.