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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A question, not the answer

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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?
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Ethereum 101

Go from “what is Ethereum” to deploying your own crowdfunding contract. Meet the world computer, accounts, and gas, then write, deploy, and use a real contract that collects contributions and refunds them if the goal falls short.

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IntermediateERC-721 · NFTs

Tokenization

A token gives any item a digital passport: proof of ownership you carry in your wallet and apps can read. Create your own ERC-721 token, mint it, send it to another account, and control who else can move it.

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Learning LabInteractive Ethereum labs, concepts to code.