Where can I buy DeFi stock?

Excuse me, could you please clarify for me where exactly one might go to purchase shares or stocks in decentralized finance, or DeFi, as it's commonly referred to? I've been hearing a lot about the potential of this sector and am eager to explore investment opportunities, but I'm not entirely sure of the most appropriate avenues to do so. Could you perhaps guide me towards any reputable exchanges, platforms, or other means of acquiring DeFi-related assets? Your insights would be greatly appreciated.