This video, History Of Decentralized Finance Explained, (DEFI) provides a very nice history of decentrailzed finance.
Per this article, Decentralized Finance (DeFi) is combining cryptocurrency and smart contracts to create an entire financial system (loans, deposits, payments, insurance) that is fairer, more reliable, and more efficient than the one that imploded in 2008.
This video interview of Mark Cuban is excellent for understanding DEFI.
Here is a history of Non-Fungible Tokens (NFTs). This is another history of NFTs.
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Are we just scratching the surface when it comes to what NFTs are capable of?