Security focus

Web3 is the frontier, the Wild West, and DeFi is a huge draw for fraud, theft, hacking. We need to keep security as a focus at the foreground of our work. What are some good resources?

Here are some recent security failures we might learn from.

https://chainsec.io/defi-hacks/
https://quillhashteam.medium.com/200-m-venus-protocol-hack-analysis-b044af76a1ae