A comprehensive, hands-on tutorial series taking you from zero to deploying production-ready smart contracts on Ethereum.
Want to go deeper beyond the tutorial? This book teaches how to build smart contracts and decentralized applications (DApps) using Solidity and Ethereum with clear step-by-step examples.
Buy the Book on Amazon →Companion book for this Solidity tutorial series.
From beginner fundamentals to advanced security patterns — structured learning for the next generation of Web3 developers.
Every concept illustrated with practical, runnable Solidity code you can deploy immediately.
Learn common attack vectors and how to guard against them. Security is woven into every lesson.
Write efficient contracts that minimize transaction costs for your users.
Master ERC-20, ERC-721, and production-grade design patterns used by top protocols.
Progress from complete beginner to advanced smart contract developer at your own pace.
What is Solidity, how does the EVM work, and why smart contracts matter.
Remix IDE, Hardhat, and MetaMask — get your dev toolchain ready to build.
Write, compile, and deploy a HelloWorld contract step-by-step.
uint, int, bool, address, bytes, strings — master Solidity's type system.
public, private, internal, external — control who can call your functions.
if/else, for loops, while loops, and break/continue in smart contracts.
Fixed and dynamic arrays, key-value mappings, and nested data structures.
Group related data with structs and represent states cleanly with enums.
Emit events, index parameters, and listen for contract activity off-chain.
Create reusable access control and validation logic with function modifiers.
Extend contracts with is keyword, override functions, and call super.
Define contract APIs, achieve polymorphism, and write composable code.
require, revert, assert — handle errors gracefully and save users gas.
Denominations of ETH, sending and receiving ether, and balance tracking.
Accept ETH payments, handle the receive() and fallback() functions.
Global variables — who is calling, how much they sent, and block context.
Understand the EVM data locations and how they affect gas costs.
Patterns and techniques to dramatically reduce gas consumption in your contracts.
Build a fully compliant fungible token from scratch with transfer and allowance logic.
Mint, transfer, and manage non-fungible tokens with the ERC-721 interface.
Common vulnerabilities, audit checklists, and defensive programming practices.
How the DAO hack happened, why it matters, and how to prevent it in your code.
Bring real-world data on-chain with decentralized oracles and price feeds.
Proxy patterns (UUPS, Transparent) to make your contracts upgradeable post-deploy.
Testnets, verification on Etherscan, deployment scripts, and going live safely.