https://crypto-economy.com/what-is-polkadot-network-a-brief-introduction-to-ethereum-rival/
What is Polkadot Network: A Brief Introduction to Ethereum Rival?
What is Polkadot Network? Polkadot is an open-source blockchain network that runs independent blockchain called parachains on its core.
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https://www.educative.io/courses/ethereum-blockchain-development-with-solidity-and-nextjs/introduction-to-ethereum
Introduction to Ethereum Blockchain and Smart Contracts
Learn about Ethereum's history, its cryptocurrency Ether, smart contracts, accounts, wallets, and networks including mainnet and testnets.
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