Ship real smart contracts in a weekend. A bookmarkable Solidity reference plus two end-to-end labs that take you from MetaMask install to a verified Sepolia contract with a working DApp frontend. No prior Solidity required.
Four concrete skills, every one of them transferable to any production-grade Ethereum app you'll ever build.
From pragma to immutable, custom errors, events, mappings, and the CEI pattern. Modern 0.8.x idioms only.
MetaMask, faucets, Remix IDE, then publish your verified source on Etherscan so anyone can audit it.
Vanilla HTML + ethers.js v6 — connect a wallet, read state, send transactions, subscribe to live events. No build tools, no React.
Use immutable and the absence of admin functions to make on-chain promises users don't need to take your word on.
Reference first if you want the vocabulary; jump straight to a lab if you'd rather learn by shipping. They're designed to flow either way.
A cheatsheet, not a tutorial. Pragma, types, visibility, state mutability, mappings, events, errors, modifiers, and the three ways to send ETH — with comparison tables you'll come back to every time you forget which one to use.
A trustless fundraiser. The deployer locks in a beneficiary and a target at deploy time; anyone can donate; only the beneficiary can withdraw once the target is met. The deployer can never change their mind — enforced by immutable, not trust.
A two-phase economy: primary sale (deployer receives ticket revenue) plus a peer-to-peer resale market where any owner can list their ticket at a custom price. Two ETH flows, structs, ownership transfers, and a richer DApp frontend with live marketplace updates.
There's no required order, but here's what tends to work best.
Skim the Solidity Reference top-to-bottom (~15 min) just to see what's in there. You don't need to memorise anything — Lab 1 will reintroduce every keyword as it appears.
Two four-hour blocks, one for foundations + first contract, one for the Donation Pool DApp. After this you'll have a verified contract on Sepolia and a working frontend you can share with anyone.
Lab 2 assumes Lab 1's setup is done — so it's shorter (~4 h). It introduces structs, the marketplace listing pattern, and a richer multi-action frontend.
The reference is keyed to each lab's sections — when a lab uses immutable or .call, click through to the reference's deeper treatment. Read sideways, build forward.
If you can read an async function and a <button> tag, you're set. No frameworks needed.
Chrome, Firefox, Brave, or Edge. Safari works but MetaMask support is less convenient.
For one of the Sepolia faucets. We use only the public testnet, nothing costs real money.
Every keyword is introduced as it appears. The reference is there for fast lookup whenever you need it.
These labs are condensed for hands-on builders. If you want the full pedagogical journey — Bitcoin foundations, decentralisation, proof of stake, enterprise blockchains, ERC-20 tokens, Layer 2 — the complete Blockchain course has 20 modules going from "why does Bitcoin exist?" to "deploying to Arbitrum". The labs here are Part 2 in concentrated form.
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