The "SWC Registry" (Smart Contract Weakness Classification) is an effort to catalog and categorize Smart Contract weaknesses. Browsing through it you'll learn about various Smart Contract vulnerabilities which have been used to exploit projects in the past.
If applicable the relationships to CWEs (Common Weakness Enumeration) are shown. There are also test cases you can use to check if your project is vulnerable to be exploited via the security hole in question.
- SmartContractSecurity