# Foundational topics

- [Intro to the Electroneum Smart Chain](/foundational-topics/intro-to-the-electroneum-smart-chain.md)
- [Intro to ETN](/foundational-topics/intro-to-etn.md)
- [Intro to dapps](/foundational-topics/intro-to-dapps.md)
- [Web2 vs Web3](/foundational-topics/web2-vs-web3.md)
- [Accounts](/foundational-topics/accounts.md)
- [Transactions](/foundational-topics/transactions.md)
- [Blocks](/foundational-topics/blocks.md)
- [Electroneum Virtual Machine (EVM)](/foundational-topics/electroneum-virtual-machine-evm.md)
- [Opcodes](/foundational-topics/electroneum-virtual-machine-evm/opcodes.md): OPCODES FOR THE EVM
- [Gas and Fees](/foundational-topics/gas-and-fees.md)
- [Nodes and clients](/foundational-topics/nodes-and-clients.md)
- [Networks](/foundational-topics/networks.md)
- [Consensus mechanisms](/foundational-topics/consensus-mechanisms.md)
- [IBFT](/foundational-topics/consensus-mechanisms/ibft.md): Istanbul Byzantine Fault Tolerant