How do I get a DeFi token?

Could you elaborate on the steps involved in acquiring a DeFi token? I'm new to this realm of cryptocurrency and finance, and I'm curious about the process. I've heard that decentralized finance, or DeFi, offers novel ways to trade and invest in tokens, but I'm not sure where to start. Could you walk me through the necessary steps, from selecting a suitable platform to actually purchasing the token? I'd appreciate any guidance you could provide on this matter.