UC Berkeley DeFi Mooc https://youtube.com/channel/UCB67PxhB5LAWEbI4etQS7aw
Smart contract security auditing https://secureum.substack.com/archive
Tim Roughgarden, Foundations of Blockchains https://youtube.com/playlist?list=PLEGCF-WLh2RLOHv_xUGLqRts_...
https://github.com/ethereumbook/ethereumbook