From Week in ethereum (by petty)- https://our.status.im/what-is-a-security-audit-when-you-should-get-one-and-how-to-prepare/
From week in eth - https://consensys.net/diligence/blog/2021/02/fault-localisation-with-tarantula/
Rajeev Gopalakrishna - https://secureum.substack.com/p/smart-contract-security-resources
Rajeev Gopalakrishna - https://secureum.substack.com/p/smart-contract-security-101-secureum
the guys mentioned in the audit section here: https://blog.gnosis.pm/2020-dex-bug-bounty-210f2b67a764
Consensys diligence. $3000 quick audit.