development

Web3 for Web2 Developers

A practical Web3 course for experienced Web2 developers, with no prior blockchain knowledge assumed. Twenty-one chapters take you from consensus and wallets through Solidity contracts, testing, tokens, frontend integration with wagmi and viem, payments, oracles, DeFi, Bitcoin's UTXO model and Lightning, L2 deployment, a full Solana deep dive, and a security auditing mindset. Every chapter mixes mental models with runnable code, a decision gate, and a hands-on checklist. All work happens on testnets; no real funds required. It ends with a capstone: a deployed full-stack testnet dApp with a written security self-review, which earns the certificate.

145 lessons30h 0mintermediateoliseh Geneis

About this course

What you'll learn

1. Blockchain Foundations and Consensus 2. Ethereum Account Models: EOAs and Contract Accounts 3. Wallets: Keys, Seed Phrases and Creation 4. Faucets and Testnets, Deep Dive 5. Transactions: Sending, Signing and Exploring 6. Secure Key and Env Management (dotenvx) 7. SDKs, Languages and Why They Work This Way 8. Frameworks: Remix, Foundry and Hardhat 9. Smart Contracts 101 10. Contract Design Patterns and Testing 11. Upgradeable Contracts (Proxies) 12. Tokens and NFTs (ERC-20 / ERC-721) 13. Frontend Integration: Apps and Hooks 14. On-Ramps, Off-Ramps and Payments 15. Oracles 16. Types of DeFi and DeFi Primitives 17. L1 vs L2: Scaling, Rollups and Where to Deploy 18. Bitcoin: UTXOs, Script, and the Original Layer 2 19. Solana Deep Dive (Anchor, SPL, Metaplex) 20. Security and Auditing Mindset 21. Capstone Project

Course modules

21 sections · 145 lessons

Blockchain Foundations and Consensus

Explain what a blockchain actually is, why consensus is the hard problem it solves, and how Ethereum's proof of stake works well enough to reason about everything else in this course.

7 lessons

1.0Blockchain Foundations and Consensus
1.1What a Blockchain Actually Is
1.2The Agreement Problem and Sybil Resistance
1.3Ethereum's Proof of Stake, Concretely
1.4