PricingLoginStart free
Web3 & DApp Development Fundamentals logo
BeginnerWebSecurityLevels A1 → C222 languages

Web3 & DApp Development Fundamentals

Master the essentials of Web3 and decentralized application development, from blockchain basics to deploying smart contracts and building robust DApps. A CoddyKit learning path of 29 short courses and 105 interactive lessons, with a 24/7 AI tutor at your side.

Courses
29
Lessons
105
Interactive steps
1,307
Free to start
Course 1
Curriculum

29 courses in this path

Every course in the Web3 & DApp Development Fundamentals path, in learning order. The first one is free.

1

A13 lessonsFree

Dive into the foundational concepts of Web3, understanding its core principles and how blockchain technology powers the decentralized web. Explore the paradigm shift from Web2 to Web3.

  1. 1What is Web3?
  2. 2Blockchain Core Concepts
  3. 3Decentralization & Consensus
Start learning free
2

A24 lessonsPRO

Blockchain Data Structures: Blocks and Chains, Merkle Trees, and more.

  1. 1Blocks and Chains
  2. 2Merkle Trees
  3. 3Hashing in Blockchain
  4. +1 more
Start learning freeUnlock with PRO
3

A24 lessonsPRO

Gas and Transactions: What Is Gas, Transaction Lifecycle, and more.

  1. 1What Is Gas
  2. 2Transaction Lifecycle
  3. 3Gas Limits and Fees
  4. +1 more
Start learning freeUnlock with PRO
4

A24 lessonsPRO

Solidity Data Types Deep Dive: Value Types, Reference Types, and more.

  1. 1Value Types
  2. 2Reference Types
  3. 3Storage vs Memory
  4. +1 more
Start learning freeUnlock with PRO
5

A23 lessonsPRO

Grasp the cryptographic principles that secure blockchain transactions and user identities. Learn how to manage digital assets using cryptocurrency wallets like MetaMask.

  1. 1Cryptography for Blockchains
  2. 2Public/Private Keys & Wallets
  3. 3Introduction to MetaMask
Start learning freeUnlock with PRO
6

A23 lessonsPRO

Delve into the Ethereum blockchain, its architecture, and the revolutionary concept of smart contracts. Understand how these self-executing agreements work.

  1. 1The Ethereum Blockchain
  2. 2What are Smart Contracts?
  3. 3EVM & Gas Mechanics
Start learning freeUnlock with PRO
7

A23 lessonsPRO

Start your journey in smart contract development by learning the fundamentals of Solidity, the primary language for writing contracts on Ethereum-compatible blockchains.

  1. 1Introduction to Solidity
  2. 2Variables & Data Types
  3. 3Functions & Control Structures
Start learning freeUnlock with PRO
8

A23 lessonsPRO

Gain hands-on experience by using Remix IDE, a powerful browser-based tool for writing, compiling, deploying, and interacting with Solidity smart contracts.

  1. 1Remix IDE Overview
  2. 2Compiling Smart Contracts
  3. 3Deploying & Interacting
Start learning freeUnlock with PRO
9

B14 lessonsPRO

Consensus Mechanisms: Proof of Work, Proof of Stake, and more.

  1. 1Proof of Work
  2. 2Proof of Stake
  3. 3Other Mechanisms
  4. +1 more
Start learning freeUnlock with PRO
10

B14 lessonsPRO

Events and Logging in Solidity: Declaring Events, Indexed Parameters, and more.

  1. 1Declaring Events
  2. 2Indexed Parameters
  3. 3Listening for Events
  4. +1 more
Start learning freeUnlock with PRO
11

B14 lessonsPRO

ERC-20 Token Development: The ERC-20 Standard, Implementing a Token, and more.

  1. 1The ERC-20 Standard
  2. 2Implementing a Token
  3. 3Allowances
  4. +1 more
Start learning freeUnlock with PRO
12

B14 lessonsPRO

ERC-721 NFT Development: The ERC-721 Standard, Minting NFTs, and more.

  1. 1The ERC-721 Standard
  2. 2Minting NFTs
  3. 3Token Metadata
  4. +1 more
Start learning freeUnlock with PRO
13

B14 lessonsPRO

Hardhat Development Environment: Hardhat Setup, Compiling Contracts, and more.

  1. 1Hardhat Setup
  2. 2Compiling Contracts
  3. 3Scripts and Tasks
  4. +1 more
Start learning freeUnlock with PRO
14

B14 lessonsPRO

ethers.js and web3.js: Connecting to a Provider, Reading Contract Data, and more.

  1. 1Connecting to a Provider
  2. 2Reading Contract Data
  3. 3Sending Transactions
  4. +1 more
Start learning freeUnlock with PRO
15

B13 lessonsPRO

Master the art of building interactive and responsive front-ends for DApps, connecting them seamlessly with smart contracts and enabling user interactions.

  1. 1React & Web3 Frameworks
  2. 2Integrating Wallets
  3. 3Handling Transactions & Events
Start learning freeUnlock with PRO
16

B24 lessonsPRO

EVM Fundamentals: The Ethereum Virtual Machine, Storage, Memory, Stack, and more.

  1. 1The Ethereum Virtual Machine
  2. 2Storage, Memory, Stack
  3. 3Opcodes
  4. +1 more
Start learning freeUnlock with PRO
17

B24 lessonsPRO

Testing Smart Contracts: Writing Tests, Testing Reverts and Events, and more.

  1. 1Writing Tests
  2. 2Testing Reverts and Events
  3. 3Coverage and Gas Reports
  4. +1 more
Start learning freeUnlock with PRO
18

B24 lessonsPRO

OpenZeppelin Contracts: Why OpenZeppelin, Access Control, and more.

  1. 1Why OpenZeppelin
  2. 2Access Control
  3. 3Token Extensions
  4. +1 more
Start learning freeUnlock with PRO
19

B23 lessonsPRO

Explore how DApps can securely interact with real-world data and external systems using blockchain oracles, overcoming the limitations of on-chain data.

  1. 1The Oracle Problem
  2. 2Chainlink Fundamentals
  3. 3Fetching Off-Chain Data
Start learning freeUnlock with PRO
20

B23 lessonsPRO

Discover alternatives to centralized cloud storage for DApp assets. Learn about IPFS and other decentralized storage solutions for resilient and censorship-resistant data hosting.

  1. 1Introduction to IPFS
  2. 2Storing DApp Assets
  3. 3Filecoin & Decentralized Storage
Start learning freeUnlock with PRO
21

B24 lessonsPRO

Foundry Toolkit: Foundry vs Hardhat, forge Testing, and more.

  1. 1Foundry vs Hardhat
  2. 2forge Testing
  3. 3Fuzzing and Invariants
  4. +1 more
Start learning freeUnlock with PRO
22

B23 lessonsPRO

Understand the fundamental structure of a Decentralized Application (DApp), including how front-end interfaces connect and interact with smart contracts on the blockchain.

  1. 1Front-end & Back-end in Web3
  2. 2Connecting to Ethereum (Web3.js/Ethers.js)
  3. 3Basic DApp Example
Start learning freeUnlock with PRO
23

C13 lessonsPRO

Elevate your Solidity skills by exploring advanced contract design patterns, industry-standard token specifications, and best practices for writing secure and efficient code.

  1. 1ERC Standards (ERC-20, ERC-721)
  2. 2Contract Security Best Practices
  3. 3Upgradeable Contracts
Start learning freeUnlock with PRO
24

C14 lessonsPRO

DeFi Protocols and AMMs: DeFi Overview, Automated Market Makers, and more.

  1. 1DeFi Overview
  2. 2Automated Market Makers
  3. 3Liquidity Pools
  4. +1 more
Start learning freeUnlock with PRO
25

C14 lessonsPRO

DAO Development: What Is a DAO, Governance Tokens, and more.

  1. 1What Is a DAO
  2. 2Governance Tokens
  3. 3Proposals and Voting
  4. +1 more
Start learning freeUnlock with PRO
26

C14 lessonsPRO

Layer 2 and Scaling: Why Layer 2, Rollups, and more.

  1. 1Why Layer 2
  2. 2Rollups
  3. 3Bridging Assets
  4. +1 more
Start learning freeUnlock with PRO
27

C14 lessonsPRO

Cross-Chain and Bridges: Cross-Chain Concepts, Bridge Architectures, and more.

  1. 1Cross-Chain Concepts
  2. 2Bridge Architectures
  3. 3Bridge Security Risks
  4. +1 more
Start learning freeUnlock with PRO
28

C14 lessonsPRO

Smart Contract Gas Optimization: Gas Cost Model, Storage Optimization, and more.

  1. 1Gas Cost Model
  2. 2Storage Optimization
  3. 3Loop and Calldata Tricks
  4. +1 more
Start learning freeUnlock with PRO
29

C23 lessonsPRO

Fortify your DApps by identifying common smart contract vulnerabilities, utilizing security tools, and understanding the importance of professional audits for production-ready applications.

  1. 1Common Smart Contract Vulnerabilities
  2. 2Security Tools & Audits
  3. 3Gas Optimization Techniques
Start learning freeUnlock with PRO
CoddyKit PRO

Unlock all 29 courses in this path, and every other path

AI tutor, certification exam and certificate. Works on web, iOS and Android.

See all plans
Yearly$29.90 / yearAbout $2.49 a monthPay onceLifetime$69.99 onceNo renewals. PRO forever.
Course Overview

Web3 & DApp Development: From Blockchain Basics to Production Contracts

Web3 is the layer of the internet built on public blockchains — where programs run as smart contracts, assets are owned by users rather than platforms, and trust is enforced by code rather than institutions. This track covers everything from how a blockchain actually stores data through writing, testing, and deploying production-grade decentralized applications on Ethereum and compatible chains.

What You Will Learn

You will start with blockchain data structures, cryptography, and how gas and transactions work, then move into Solidity — its type system, events, and common patterns. From there you will build real token standards: ERC-20 fungible tokens and ERC-721 NFTs. The toolchain gets full coverage: Remix IDE for early prototyping, Hardhat and Foundry for professional development and testing, ethers.js and web3.js for front-end integration, and OpenZeppelin for audited base contracts. Upper levels cover oracles and off-chain data, decentralized storage with IPFS, DeFi protocol mechanics and AMMs, DAO development, Layer 2 scaling, cross-chain bridges, gas optimization, and smart contract security auditing.

The Learning Path

Twenty-nine courses progress from A1 through C2. The A-level courses establish blockchain fundamentals, the EVM, wallets, and basic Solidity. B-level courses build out the full development workflow — consensus mechanisms, token contracts, professional tooling, front-end DApp architecture, and EVM internals. The track finishes at C1 and C2 with Advanced Solidity Patterns, DeFi Protocols and AMMs, DAO Development, Layer 2 and Scaling, Cross-Chain and Bridges, Smart Contract Gas Optimization, and DApp Security & Auditing.

How It Works

Each course is split into short, hands-on lessons you complete in the built-in editor with real-time feedback and an AI tutor when you get stuck. Solidity code runs against live test environments so you can see your contracts behave before deploying anywhere real.

Tools

Practice with AI, not just read

Supercharge your learning with AI-powered tools and features

AI ChatChat with AI tutorAsk Super QuestionGet expert-level answersPROCreate LessonAI-powered lesson builderPROStart Certification ExamEarn your certificatePROStart ChallengeTest your skills

How You'll Learn

  1. 01

    Interactive Lessons

    Hands-on coding exercises with real-time feedback

  2. 02

    AI Tutor

    Get instant help from our AI when you're stuck

  3. 03

    Built-in Editor

    Write and run code directly in your browser

  4. 04

    Certificate

    Earn a certificate when you complete the course

Keep exploring

Related learning paths

Blockchain Smart Contracts with Solidity logoBlockchain Smart Contracts with SolidityMaster the art of building secure and efficient decentralized applications by learning Bl…Next.js 15 Fullstack Web Apps logoNext.js 15 Fullstack Web AppsMaster building high-performance, fullstack web applications with Next.js 15, from founda…Docker & DevOps Fundamentals logoDocker & DevOps FundamentalsMaster Docker containerization and essential DevOps practices to streamline your software…Node.js Backend Development Bootcamp logoNode.js Backend Development BootcampMaster Node.js to build robust and scalable backend applications with this comprehensive…Edge Computing with Cloudflare Workers & Deno logoEdge Computing with Cloudflare Workers & DenoMaster the fundamentals and advanced techniques of edge computing by building highly perf…Electron Desktop App Development logoElectron Desktop App DevelopmentMaster the art of building powerful cross-platform desktop applications using web technol…
FAQ

Frequently Asked Questions

Is the Web3 & DApp Development Fundamentals course free?

Yes. You can start the Web3 & DApp Development Fundamentals course for free and complete its interactive lessons at no cost. An optional PRO subscription unlocks advanced AI tools and a shareable certificate.

Do I need prior experience to learn Web3 & DApp Development Fundamentals?

No. The course begins with the fundamentals and gradually moves to more advanced topics, so you can start even with no prior Web3 & DApp Development Fundamentals experience.

How will I learn Web3 & DApp Development Fundamentals on CoddyKit?

You learn by doing. Short interactive lessons pair a clear explanation with a hands-on coding exercise that runs in real time, and a 24/7 AI tutor gives personalized help whenever you get stuck.

Do I get a certificate for completing Web3 & DApp Development Fundamentals?

Yes. PRO learners can take an exam and earn a shareable certificate of completion with a verifiable code for the Web3 & DApp Development Fundamentals course.

Can I learn Web3 & DApp Development Fundamentals on my phone?

Yes. CoddyKit is available on the web and as native iOS and Android apps, so you can learn Web3 & DApp Development Fundamentals on any device and your progress syncs across them.

How much does CoddyKit PRO cost?

The first course of Web3 & DApp Development Fundamentals is free. CoddyKit PRO unlocks every course: $5.90 per week, $7.90 per month, $29.90 per year, or $69.99 once for lifetime access with no renewals.

How long does it take to complete Web3 & DApp Development Fundamentals?

Web3 & DApp Development Fundamentals has 29 courses and 105 lessons. Most lessons take about 5–10 minutes, so the whole path is roughly 12 hours of hands-on practice, at your own pace.

Start Web3 & DApp Development Fundamentals Now

Join thousands of learners mastering programming with AI-powered lessons.

Start learning freeBrowse All Courses