Updated in May 2025.

This course now features Coursera Coach! A smarter way to learn with interactive, real-time conversations that help you test your knowledge, challenge assumptions, and deepen your understanding as you progress through the course. In the rapidly evolving world of blockchain technology, mastering Solidity is crucial for developing secure and efficient smart contracts. This advanced course takes you beyond the basics, guiding you through complex Solidity concepts and the intricacies of secure contract development. Each module is meticulously designed to deepen your understanding of Solidity, from recognizing common vulnerabilities to implementing robust security measures. The course begins with essential advice on approaching new Solidity concepts, gradually leading you through advanced topics such as looping and transactions, points of failure in contracts, and the significance of safe contract design. You'll explore critical issues like whether contracts should be allowed to receive funds and how to protect them from common exploits. Through a combination of theoretical insights and practical exercises, you will learn to recognize, analyze, and mitigate security risks in smart contracts. As you progress, you’ll engage with hands-on coding exercises that solidify your learning, including creating and securing smart contracts, understanding complex patterns like the "Only After" modifier, and mastering advanced concepts such as inheritance and abstract contracts. By the end of this course, you’ll not only be proficient in Solidity but also equipped with the skills to develop secure, high-performing blockchain applications. This course is tailored for experienced developers familiar with basic Solidity concepts who are looking to advance their skills in secure smart contract development. Prerequisites include a solid understanding of fundamental Solidity, blockchain principles, and some experience with writing and deploying smart contracts.