Can you lose money in DeFi?

Can you really lose money when investing in DeFi, or is it all hype? I've heard that DeFi, or Decentralized Finance, offers higher returns than traditional finance, but I'm concerned about the risks involved. After all, these platforms operate on blockchain technology, which can be complex and sometimes unpredictable. So, what are the potential pitfalls of investing in DeFi, and how can I protect myself from losing money?