Editor's top Solidity courses
2Cyfrin Updraft — Solidity & Smart Contract Security
Cyfrin (Patrick Collins)
The most complete free curriculum in web3 — from first contract through advanced Foundry testing and security auditing, taught by the instructor whose YouTube courses onboarded much of the current generation of Solidity engineers.
Access freeThe Ethernaut
OpenZeppelin
Wargame of hackable contracts, each teaching a real vulnerability class — reentrancy, delegatecall abuse, storage collisions. The standard rite of passage; auditors list Ethernaut completion the way pentesters list CTF ranks.
Access freeSolidity Courses for Beginners
1Cyfrin Updraft — Solidity & Smart Contract Security
Cyfrin (Patrick Collins)
The most complete free curriculum in web3 — from first contract through advanced Foundry testing and security auditing, taught by the instructor whose YouTube courses onboarded much of the current generation of Solidity engineers.
Access freeIntermediate & Advanced Solidity Courses
2The Ethernaut
OpenZeppelin
Wargame of hackable contracts, each teaching a real vulnerability class — reentrancy, delegatecall abuse, storage collisions. The standard rite of passage; auditors list Ethernaut completion the way pentesters list CTF ranks.
Access freeDamn Vulnerable DeFi
The Red Guild
The advanced security gauntlet — flash loan attacks, oracle manipulation, and governance exploits recreated from real DeFi incidents. Completing it is the strongest free signal you can put on an auditor CV.
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Solidity resources
3 free courses
Free access options — some may have optional paid upgrades.