ERC20 and TRC20 will be made using these concepts

https://github.com/OpenZeppelin/openzeppelin-contracts

https://maksimivanov.com/posts/gradient-coin-tutorial/

https://lightrains.com/blogs/how-to-create-mineable-erc20-tokens


Cloning Ethereum takes 15 min
https://medium.facilelogin.com/build-your-own-blockchain-b8eaeea2f891