Learn Ethereum
by doing.

Interactive, browser-based labs to learn Ethereum, the EVM, and Solidity by doing. You build real contracts, compile, deploy, and wire them with an UI.

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Learning Lab · ethereum-101 / socratic-tutor
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Your refund() reverts. What should contributions[msg.sender] be at this point?
The amount they put in?
Right. So if you send the ETH first and zero it out after, what could a malicious contract do in between?
Curriculum

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BeginnerConcepts

Ethereum 101

Meet the world computer. Learn what Ethereum is, what people build with it, and how it works. Explore wallets, smart contracts, and transactions through interactive examples. No coding needed.

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BeginnerTransactions

Wallets

Set up a wallet, protect your recovery phrase, and get test ETH. Send a transaction, check it on a block explorer, and use your wallet to interact with an app.

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BeginnerSolidity coding

Crowdfunding Contract

Build your own crowdfunding contract in Solidity. Write the rules, deploy it in your browser, and collect contributions. Test what happens when the goal is reached and how refunds work when it is not.

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Learning LabInteractive Ethereum labs, concepts to code.

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