DeFi introduction

Explore the fundamentals of decentralized finance (DeFi) including key concepts, protocols, and the significance of DeFi in the financial sector.

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Course Overview

About the course

What you'll learn

Advanced smart contract development

How to develop a stablecoin

How to develop a DeFi protocol

How to develop a DAO

Advanced smart contracts testing

Fuzz testing

Manual verification

Course Description

Who is this course for?

Engineers
Smart Contract Security researchers

Potential Careers

Web3 Developer Relations

$85,000 - $125,000 (avg. salary)

Web3 developer

$60,000 - $150,000 (avg. salary)

Smart Contract Engineer

$100,000 - $150,000 (avg. salary)

Smart Contract Auditor

$100,000 - $200,000 (avg. salary)

Security researcher

$49,999 - $120,000 (avg. salary)

Meet your instructors

Patrick Collins

Founder at Cyfrin

Web3 engineer, educator, and Cyfrin co-founder. Patrick's smart contract development and security courses have helped hundreds of thousands of engineers kickstarting their careers into web3.

Guest lecturers:

Juliette Chevalier

Lead Developer relations at Aragon

Ciara Nightingale

Developer relations at Thirdweb

Vasiliy Gualoto

Developer relations at Cyfrin

Nader Dabit

Director of developer relations at Avara

Ally Haire

Developer relations at Protocol Labs

Harrison

Founder at GasliteGG

Vitto Rivabella

Lead Developer relations at Cyfrin

Last updated on September 2, 2024

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Solidity Developer

Advanced Foundry

Section 1: Develop an ERC20 Crypto Currency

Duration: 36min

Section 2: Develop an NFTs Collection

Duration: 3h 06min

Section 3: Develop a DeFi Protocol

Duration: 5h 02min

1. DeFi introduction

Explore the fundamentals of decentralized finance (DeFi) including key concepts, protocols, and the significance of DeFi in the financial sector. Duration: 10min

2. Project code walkthrough

Delve into the detailed walkthrough of DeFi codebase including analysis of key files and their functionalities in the DeFi environment. Duration: 4min

3. Introduction to stablecoins

Gain insights into stablecoins, their types, significance in DeFi, and the roles they play in maintaining economic stability in digital finance. Duration: 29min

4. DecentralizedStableCoin.sol

Understand the creation and management of decentralized stablecoins, focusing on their development, operational mechanics, and impact on DeFi. Duration: 15min

5. Project setup - DSCEngine

Learn about setting up the DSCEngine project in DeFi, including configuration, development practices, and key components of the engine. Duration: 11min

6. Create the deposit collateral function

This lesson covers the process of creating a function to deposit collateral in a DeFi project, highlighting key aspects of its implementation. Duration: 19min

7. Creating the mint function

Explore the intricacies of creating a mint function in DeFi, focusing on its role, functionality, and integration within the DeFi ecosystem. Duration: 17min

8. Creating and retrieving the health factor

Delve into the concept of 'Health Factor' in DeFi protocols, its calculation, significance, and impact on the stability and risk management of DeFi projects. Duration: 7min

9. Finish the mint function

Complete the development of the mint function in DeFi, focusing on optimizing functionality, ensuring security, and integrating with the overall system. Duration: 2min

10. Creating the deployment script

Learn the process of creating a deploy script for DeFi projects, including setup, configuration, and deploying smart contracts to the blockchain. Duration: 15min

11. Test the DSCEngine smart contract

Understand the process and importance of testing DSCEngine smart contracts in DeFi, including methodologies, best practices, and common test scenarios. Duration: 12min

12. Create the depositAndMint function

This lesson focuses on developing a combined deposit and mint function in DeFi, emphasizing its efficiency and integration into the DeFi framework. Duration: 3min

13. Create the redeem collateral function

Explore the development of a function for redeeming collateral in DeFi, including its significance, operational process, and impact on users. Duration: 12min

14. Setup liquidations

Dive into setting up liquidations in DeFi protocols, understanding their mechanics, importance, and their role in maintaining financial stability. Duration: 17min

15. Refactor liquidations

This lesson focuses on refining the DeFi protocol by refactoring the 'redeemCollateral()' function. It covers the importance of testing and refactoring for building a reliable DeFi protocol, enhancing security, and improving functionality. Duration: 13min

16. DSCEngine advanced testing

This lesson dives into advanced testing techniques for Ethereum smart contracts using Foundry. It emphasizes the significance of testing for function initialization and demonstrates constructing and executing thorough test cases. Duration: 17min

17. Create the fuzz tests handler pt.1

Part 1 of this lesson introduces the concept of fuzz testing in Foundry, focusing on creating detailed invariant tests for smart contracts. It guides through setting up the testing environment and structuring invariants and handlers. Duration: 14min

18. Create the fuzz tests handler pt.2

In Part 2, the focus shifts to crafting optimized handlers for valid function calls in smart contracts. The lesson covers the groundwork of creating function handlers and improving test efficiency through valid and efficient function calls. Duration: 20min

19. Defi Handler Deposit Collateral

We set the revert on fail condition for this lesson. Duration: 18min

20. Create the collateral redeemal handler

This lesson delves into the mechanisms of handling collateral in blockchain transactions. It focuses on the implementation and testing of functions for depositing and redeeming collateral, emphasizing the importance of validity checks. Duration: 6min

21. Create the mint handler

Lesson 21 guides through testing the 'mintDsc()' function in DSCEngine. It involves creating a handler function to ensure safe minting of DSC, considering the user's health factor and the system's overall stability. Duration: 6min

22. Debugging the fuzz tests handler

This lesson explores debugging strategies for smart contracts, particularly focusing on the use of 'ghost variables' to track function calls. It provides insights into handling errors and refining the testing process for better outcomes. Duration: 9min

23. Create the price feed handler

The lesson focuses on integrating price feed updates in smart contract handlers. It covers the creation of functions for updating collateral prices and emphasizes the importance of handling price fluctuations to maintain protocol integrity. Duration: 8min

24. Manage your oracles connections

This lesson addresses the implementation and management of Chainlink Price Feeds in DSCEngine. It includes creating a library for ensuring price feed accuracy and discusses the implications of stale prices on the protocol's functionality. Duration: 9min

25. Preparing your protocol for an audit

This lesson provides a comprehensive guide on preparing smart contracts for audits. It emphasizes the importance of audits, offers a readiness checklist, and introduces the concept Duration: 2min

26. Section recap

This lesson serves as a comprehensive recap of the advanced project covered in the Web 3.0 course. It celebrates the milestones achieved in exploring varied concepts such as Decentralized Finance (DeFi), advanced fuzzing techniques, digital security, and working with Oracle Duration: 4min

27. Bonus: introduction to Lens Protocol

This bonus lesson introduces the Lens Protocol, a decentralized social platform by the Aave team, presented by Nader Dabit, the head of DevRel for Lens Protocol. Lens Protocol empowers developers to build social media applications in the decentralized space, leveraging Web3 features such as native payments, ownership, and composability. Duration: 3min

Section 4: Airdrop and Signatures

Duration: 2h 47min

Section 5: Upgradeable Smart Contracts

Duration: 1h 23min

Section 6: Account Abstraction

Duration: 4h 28min

Section 7: DAOs

Duration: 1h 19min

Section 8: Security

Duration: 58min