> For the complete documentation index, see [llms.txt](https://developer.electroneum.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.electroneum.com/foundational-topics.md).

# Foundational topics

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


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