In this DeFi vault smart contract tutorial we build a tokenized vault smart contract using the ERC4626 standard. Learn how to build a custom vault that inherits from ERC4626, add vault fees and hook up your yield strategy code. Follow along and learn this important DeFi protocol pattern. Useful links: Remix editor: https://remix.ethereum.org/ Metamask wallet: https://metamask.io/ Ethereum unit converter: https://eth-converter.com/ Sepolia faucets: https://sepoliafaucet.com/ https://www.infura.io/faucet/sepolia ERC4626 info: https://eips.ethereum.org/EIPS/eip-4626 https://ethereum.org/en/developers/docs/standards/tokens/erc-4626/ https://docs.openzeppelin.com/contracts/4.x/erc4626 implementations: https://github.com/transmissions11/solmate/blob/main/src/mixins/ERC4626.sol https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC4626.sol ERC4626 Tutorial GitHub repo: https://github.com/jspruance/erc4626-vault-tutorial Imports for remix: Vault.sol import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC4626.sol"; import "https://github.com/jspruance/erc4626-vault-tutorial/blob/main/contracts/ERC4626Fees.sol"; OceanToken.sol import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";