In this project-based web3 tutorial we build a completed lottery dApp with a focus on how to build a UI for a lottery smart contract, using the web3js library. Topics covered include: the web3js library, connecting a Metamask wallet, application binary interface (abi), NextJS, Truffle, Ethereum Rinkeby testnet, Chainlink VRN, deploying a Solidity smart contract to Ethereum and more. Completed project code: https://github.com/jspruance/block-explorer-tutorials/tree/main/apps/Lottery Lottery Smart Contract Part I https://www.youtube.com/watch?v=HR679xTt8tg Lottery Smart Contract Part II https://www.youtube.com/watch?v=_aXumgdpnPU Ether faucet on Rinkeby testnet: https://faucet.rinkeby.io/ LINK faucet on Rinkeby testnet: https://faucets.chain.link/rinkeby Address to LINK token on Rinkeby testnet: https://docs.chain.link/docs/link-token-contracts/