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Learn Ethereum: From Gas Fees to Smart Contracts

Ethereum is the programmable backbone of Web3. Learn how it works — accounts, gas, smart contracts, DeFi, and Layer 2 scaling — with free courses, journals, and a hands-on masterclass.

Learn Ethereum step by step

Structured paths from first concepts to smart contract development.

Ethereum Development Essentials masterclass
A 10-lesson path from wallets and gas to Solidity smart contracts, testing, and deployment. First two lessons free.
Ethereum Basics course
Interactive introduction to Ethereum: accounts, transactions, gas, and how the network works.
Advanced Smart Contract Development
Solidity patterns, upgradeable contracts, gas optimization, and DeFi application architecture. (Pro)
DeFi Protocol Engineering
AMMs, lending, oracles, and flash loans — the protocols that run on Ethereum. (Pro)

Journals: Ethereum and smart contracts

Deep-dives on the concepts Ethereum developers and users ask about most.

What Are Smart Contracts?
Self-executing agreements in code — what they are, how they run on Ethereum, and why they matter.
Top 10 Smart Contract Security Vulnerabilities
Reentrancy, oracle manipulation, access control failures — the bugs auditors hunt for.
What Is DeFi? A Beginner’s Guide
Decentralized finance protocols — most of which live on Ethereum — explained simply.

Glossary: Ethereum vocabulary

Every "what is…" answer in plain English.

Frequently asked questions

What is Ethereum in simple terms?
Ethereum is a programmable blockchain — a global shared computer where developers deploy smart contracts that power DeFi apps, NFTs, stablecoins, and DAOs. Its native currency is ETH.
What is gas in Ethereum?
Gas is the fee paid to the network for every operation — sending ETH, swapping tokens, or running a smart contract. Fees are priced in ETH and rise with network congestion.
What is the difference between Bitcoin and Ethereum?
Bitcoin is designed primarily as digital money with a fixed supply. Ethereum is a general-purpose platform: its main product is computation, letting anyone deploy programs (smart contracts) that move assets and enforce rules automatically.
How do I start learning Ethereum development?
Start with the fundamentals — accounts, transactions, and gas — in our free Ethereum Basics course, then move to the Ethereum Development masterclass for hands-on Solidity practice.