Smart Contract security
Understand common smart contract vulnerabilities, security best practices, and how to write secure smart contracts. This is a foundational concept in decentralized application development that professional developers rely on daily. The explanations below are written to be beginner-friendly while covering the depth and nuance that comes from real-world Blockchain/Web3 experience. Take your time with each section and practice the examples
75 min•By Priygop Team•Last updated: Feb 2026
Common Vulnerabilities
- Reentrancy: Multiple function calls before completion
- Integer Overflow/Underflow: Mathematical operation errors
- Access Control: Unauthorized function execution
- Front-running: Transaction ordering manipulation
- Denial of Service: Blocking contract functionality
security Best Practices
- Use established libraries like OpenZeppelin — a critical concept in decentralized application development that you will use frequently in real projects
- Implement proper access controls — a critical concept in decentralized application development that you will use frequently in real projects
- Test thoroughly with multiple scenarios — a critical concept in decentralized application development that you will use frequently in real projects
- Keep contracts simple and auditable — a critical concept in decentralized application development that you will use frequently in real projects
- Plan for upgradeability and emergency stops — a critical concept in decentralized application development that you will use frequently in real projects