Education & standards

WTF Solidity is a free open-source Solidity course running from basics to advanced topics, with runnable code examples in Chinese and English. Beginners work through it to learn Solidity by editing and running each example.

Speedrun Ethereum is a hands-on series of challenges designed to help you learn by building. Each challenge delivers one key "aha" moment, a mental unlock about how Ethereum really works. At the same time, you'll be building your Ethereum portfolio.

The Ethernaut is OpenZeppelin's browser capture-the-flag: each level is a broken contract you exploit to learn common Solidity vulnerabilities hands-on.

Building Secure Contracts is Trail of Bits' collection of guidelines, checklists, and training material for writing and reviewing Solidity contracts. Solidity developers work through its exercises and program analysis tutorials while building and reviewing code.

Damn Vulnerable DeFi is a hands-on Ethereum security training environment featuring realistic Solidity and DeFi exploitation challenges.

Alchemy University offers tutorials and guided learning content for Ethereum developers, including smart contract and web3 app development.

A Solidity course of short lessons on contracts, state, mappings, structs, events and require, most with a contract you write and run from the browser. It needs a free account and the free plan has a daily limit. Beginners work through it to learn the language without installing a toolchain or a wallet.

Solidity by Example is a collection of short annotated Solidity snippets organized by language feature and pattern. Builders look things up there while writing contracts.

RareSkills is an Ethereum and smart contract education platform with structured courses, bootcamps, and in-depth developer learning content.

Solidity Testing Handbook is a comprehensive guide to testing smart contracts in the Solidity programming language. It covers the basics of testing, the different types of tests, and the tools available for testing.

Updraft is Cyfrin's free, hands-on curriculum for Solidity, security, Foundry, and DeFi: use it when you want structured exercises and certifications before shipping high-risk contracts.

BuidlGuidl CTF is a Solidity challenge platform where developers solve practical Ethereum security and smart contract puzzles.

OpenRPC is JSON-RPC schema tooling and generators in the spirit of OpenAPI: you describe RPC surfaces once, then ship typed clients, docs, and tests for Ethereum and L2 JSON-RPC stacks.

evm.codes is an interactive reference for EVM opcodes where each instruction can be inspected and run. Builders use it to learn what an opcode does and to experiment with short sequences of instructions.

EIP.Tools is a browser explorer for EIPs, ERCs, RIPs, and CAIPs with search, summaries, trending views, and a relationship graph when you need to skim how standards connect.