Understanding Ethereum and the Foundations of DeFi

The rise of decentralized finance has transformed how we think about transactions, agreements, and digital ownership. To truly understand this shift, you must understand Ethereum—the global, programmable blockchain that serves as the foundation for modern decentralized applications. This text-based course guides you from foundational blockchain principles to the mechanics of smart contracts and decentralized finance (DeFi). You will gain a clear, conceptual understanding of how Ethereum operates, how transactions are validated, and how decentralized protocols are reshaping global finance. What you'll learn: Understand the core architecture of the Ethereum blockchain and how it differs from earlier networks; Explain the mechanics of smart contracts and how they execute automatically without intermediaries; Explore the transition to proof-of-stake consensus and its impact on network efficiency; Analyze key decentralized finance (DeFi) building blocks, including decentralized exchanges and lending pools; Evaluate modern scaling solutions, including Layer-2 networks, that make transactions faster and cheaper; Identify security best practices and common risks associated with interacting with Web3 protocols. The course begins with essential terminology and the basic mechanics of cryptography and decentralized networks. From there, you will progress through written explanations of smart contracts, gas fees, consensus mechanisms, and the practical landscape of DeFi applications. Designed for curious beginners and finance enthusiasts, this course requires no prior programming experience or deep technical background. Start reading today to build a solid foundation in the future of decentralized technology.