How to make sidechain like Ronin Network?

Hi Everyone,

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I'm a bit of a noob programmer here.

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Would like to know how are ethereum sidechains made like these? https://whitepaper.axieinfinity.com/technology/ronin-ethereum-sidechain

The ronin network

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Can't seem to find any tutorial how these sidechains are made. Or like a base code they use to make them?

https://ethereum.org/en/developers/docs/scaling/sidechains/ i read this but the projects mentioned are dead