DeFi security reading list
CertiK security leaderboard
https://www.certik.org/
Intrinsic Flaws in SafeMoon and Derivative Projects
https://docs.google.com/viewer?url=https:%2F%2Fnotsafemoon.com%2Fpublic%2Fdocs%2FMoonCoinsTA.pdf
rekt.news DeFi incidents leaderboard
https://rekt.news/leaderboard/
https://samczsun.com/
immunefi(smart contract bug bounty platform) write ups
https://medium.com/immunefi
DeFi and Smart Contract Incidents - 2021
https://github.com/openblocksec/blocksec-incidents/blob/main/defi/2021.md
Smart contract CTF resources
https://github.com/openblocksec/blocksec-ctfs
Blockchain threat intelligence newsletter
https://blockthreat.substack.com/
High quality educational videos on DeFi
https://www.youtube.com/c/Finematics/videos
Audit reports from Trail of Bits
https://github.com/trailofbits/publications/tree/master/reviews