Ethereum developer tools

https://ethereum.org/en/developers/

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Learn by coding

https://ethereum.org/en/developers/learning-tools/

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Ethereum Solidity in-browser IDE

https://remix.ethereum.org/

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Great overview of tools

https://docs.dorg.tech/web3-upskilling

Scafold ETH

https://scaffoldeth.io/ - Everything you need to get started building decentralized applications powered by smart contracts

Ethereum Github

https://github.com/ethereum

Bankless Academy:

https://app.banklessacademy.com/lessons

DeveloperDAO academy:

https://academy.developerdao.com/

Basenode - Paymaster Quickstart Tutorial