Solidity is an object-oriented, high-level language for implementing smart contracts. Smart contracts are programs which govern the behavior of accounts within the Ethereum state.
https://docs.soliditylang.org/en/v0.8.13/
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Youtube Playlist by Telusko
https://youtube.com/playlist?list=PLsyeobzWxl7oY6tZmnZ5S7yTDxyu4zDW- -
Udemy Course
https://www.udemy.com/course/jpcourses-ethereum-smart-contract-programming-with-solidity-project/