1. Introduction

   Let's diving into Base Learn, an incredible resource for mastering smart contract development! Whether you are a beginner or have some experience, Base Learn offers a curriculum designed to help you build the skills you need to create and deploy smart contracts on Base or any EVM-compatible blockchain, including Ethereum and Optimism. As you progress while learning, you'll earn NFTs to recognize your achievements, making your learning journey both rewarding and interactive.

   Why Choose Base Learn?

   Blockchain technology is reshaping the digital landscape, and smart contracts are at its core. Base Learn is designed to:

   1. Introduce beginners to blockchain fundamentals and the Ethereum ecosystem.

   2. Enhance expertise for experienced developers through advanced topics.

2. Provide hands-on experience with real-world tools like Hardhat, Etherscan, and Remix.

Whether you're learning to write your first "Hello World" contract or deploying an ERC-721 token, Base Learn ensures a comprehensive understanding of Web3 development.

• Understand the goals and origins of Ethereum.

• Differentiate between Web2 and Web3 development.

• Explore how gas functions in Ethereum transactions.

• Set up a Hardhat project with TypeScript support.

• Write unit tests for contracts using Mocha and Chai.

• Deploy and verify contracts on the Base Sepolia Testnet.

• Manage storage, mappings, and control structures efficiently.

• Implement inheritance and create abstract contracts.

• Construct minimal tokens adhering to ERC-20 and ERC-721 standards.

• Use wallet connectors like RainbowKit.

• Implement Wagmi hooks to read and write smart contract data.

• Enhance UX with efficient contract interaction configurations.

Let’s dive into a practical example—creating and deploying an ERC-721 NFT token on the Base Sepolia Testnet:

1. Install Hardhat by running:

   npm install --save-dev hardhat

2. Initialize a new Hardhat project and install OpenZeppelin libraries for ERC-721 implementation.

Create an NFTCollection.sol file:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract NFTCollection is ERC721, Ownable {
    uint256 public tokenCounter;

    constructor() ERC721("NFTCollection", "NFTC") {
        tokenCounter = 0;
    }

    function mintNFT(address recipient) public onlyOwner {
        _safeMint(recipient, tokenCounter);
        tokenCounter++;
    }
}

1. Configure hardhat.config.ts for the Sepolia network.

2. Use the Hardhat deployment script:

   const { ethers } = require("hardhat");
   
   async function main() {
       const NFTCollection = await ethers.getContractFactory("NFTCollection");
       const nft = await NFTCollection.deploy();
       await nft.deployed();
       console.log("NFT deployed to:", nft.address);
   }
   
   main().catch((error) => {
       console.error(error);
       process.exitCode = 1;
   });

3. Deploy by running:

• Verify the contract on BaseScan.

• Mint NFTs using the mintNFT function in Etherscan or your custom UI.

With Base Learn, you’re not just learning you’re building the future of decentralized technology. Explore modules, complete challenges, and earn NFTs to showcase your progress.

Begin your journey now and take your first step toward becoming a Onchain innovator!