BR Academy

Smart Contract Development with Solidity: Zero to Deployed

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← Smart Contract Development with Solidity: Zero to Deployed

1Solidity Foundations0/4

Solidity Syntax, Types, and Operators15m
Storage vs Memory vs Calldata, Gas Implications
Functions, Visibility, Modifiers, and State Changes
Events, Indexed Parameters, and Off-Chain Indexing
Module quiz

2Object-Oriented Solidity0/3

Inheritance, Interfaces, and Abstract Contracts
Libraries, Using-For, and Code Reuse
Custom Errors, Require/Assert/Revert, and Gas Savings
Module quiz

3Token Standards & OpenZeppelin0/4

Build an ERC-20 Token from the Spec
ERC-20 with OpenZeppelin, Extensions, and Minting
Build an ERC-721 NFT from the Spec
ERC-721 with OpenZeppelin, Metadata, and Enumeration
Module quiz

4Testing & Gas Optimization0/4

Foundry Setup, Writing Tests, and Assertions
Hardhat Testing, Fixtures, and Coverage
Profiling Gas, Identifying Bottlenecks, and Optimization Patterns
Storage Packing, Immutables, and Assembly Tricks
Module quiz

5Deployment & Verification0/4

Deploying to Sepolia, Goerli, and Other Testnets
Deploying to Mainnet, Managing Keys, and Transaction Costs
Verifying Contracts on Etherscan and Block Explorers
Pre-Deployment Audit, Common Vulnerabilities, and Best Practices
Module quiz

6Advanced Patterns0/3

UUPS and Transparent Proxies, Storage Layout, and Risks
Role-Based Access Control, OpenZeppelin AccessControl
Reentrancy Attacks, Checks-Effects-Interactions, and Guards
Module quiz

7Capstone Project0/1

Capstone: Deploy a Custom ERC-20 with Minting, Burning, and Access Control
Module quiz

Token Standards & OpenZeppelin·Lesson 10 of 23·20 min

Build an ERC-721 NFT from the Spec

This lesson is for enrolled learners

The concept ERC-721 (EIP-721) is the non-fungible token standard: unlike ERC-20's fungible balances, every token has a unique uint256 tokenId and exactly one owner at a time. The core state is mapping(uint256 => address) ownerOf and mapping(address => uint256) balanceOf (count of tokens owned, not a token amount — a crucial distinction from ERC-20 where balanceOf returns an amount of……

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