Good information on Eth2.0 and DeFi

Hey guys,

As Ethereum is a hot topic, I find it so difficult to find good sources of information and not shallow articles.

I'm mainly interested in the v2 of ETH and more generally the DeFi ecosystem built on top of Ethereum. Would you have some good sources I could follow? I'd prefer articles/books or videos. I'm not a fan of podcasts.

Thank you!