Solidity Security

This handles the security fundamentals that trip up most Solidity developers, from reentrancy guards to proper access control patterns. It covers the critical vulnerability classes you'll encounter in audits: overflow protection, front-running mitigation, and gas optimization techniques that don't compromise security. The code examples follow the checks-effects-interactions pattern and show both vulnerable and secure implementations side by side. Use this when you're writing contracts that handle real value or preparing for a professional audit. It's particularly solid on the practical stuff like emergency stops and pull-over-push patterns that separate production-ready contracts from toy examples.