文中教學來自 Alchemy Doc
該平台提共 Ethereum 開發環境（看起來跟 Infura 一樣）
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./Hello World Smart Contract
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./Interacting with a Smart Contract
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./Submitting your Smart Contract to Etherscan
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./Integrating Your Smart Contract with the Frontend
完整教學可以參考：https://vagrantpi.github.io/2021/08/25/hello-smart-contract/