Ethereum & Smart Contract Fundamentals: Build Your Own Decentralized Crowdfunding DApp with Solidity

소개

Ethereum is the backbone of decentralized finance, NFTs, and Web3 — and smart contracts are its engine. This course takes you from understanding how the Ethereum Virtual Machine actually works to writing, testing, and deploying a real crowdfunding DApp that accepts ETH contributions, enforces deadlines, and handles refunds — all trustlessly on-chain. You won't just learn Solidity syntax; you'll understand *why* smart contracts behave the way they do and *what happens* under the hood every time you deploy or call a function. The course follows a build-first methodology: every concept is immediately applied to FundChain, a decentralized crowdfunding platform you construct line by line across 10 lessons. You'll start with Ethereum's core architecture, progress through Solidity's type system and security patterns, and finish with a deployed contract connected to a live web frontend via MetaMask. Each lesson includes hands-on coding, security analysis, and automated testing — because in blockchain, untested code is untrustworthy code. The spiral approach means you'll revisit key ideas like gas, storage, and the checks-effects-interactions pattern at increasing depth as the project grows. This course is designed for developers who have basic programming experience in any language — Python, JavaScript, Java, anything with variables, functions, and conditionals — but have never written a smart contract. No prior blockchain development experience is required, though a conceptual understanding of what a blockchain is will help you ramp up faster. If you've completed a beginner blockchain or Bitcoin course and want to take the next step into building, this is your entry point. By the end, you'll have a working DApp on your GitHub portfolio that you built from scratch, the confidence to read and audit simple Solidity contracts, and a solid foundation to explore DeFi protocols, NFT contracts, and advanced Ethereum development patterns. You'll also walk away with a reusable test suite and deployment pipeline that you can apply to any future smart contract project.

학습 목표

• ✓Explain the Ethereum Virtual Machine architecture, account types (EOA vs. contract), and the full transaction lifecycle including gas computation
• ✓Write Solidity smart contracts using core data types, structs, mappings, arrays, and function visibility modifiers
• ✓Implement payable functions that safely accept, track, and transfer Ether between accounts on-chain
• ✓Apply smart contract security patterns including checks-effects-interactions, the withdrawal pattern, and reentrancy prevention
• ✓Construct and execute automated test suites for Solidity contracts using Hardhat, Ethers.js, and Chai with time manipulation
• ✓Deploy a verified smart contract to the Sepolia testnet and interact with it programmatically via deployment scripts
• ✓Build a minimal web frontend that connects a MetaMask wallet to a deployed smart contract using Ethers.js