The learning path
Ethereum is a blockchain that can run programs called smart contracts, which makes it a shared computer rather than just a payment ledger. ETH is the token used to pay for computation, and almost all stablecoins, lending markets, decentralized exchanges and NFTs run on Ethereum or on networks built on top of it.
The one sentence difference
Bitcoin's ledger records who owns what. Ethereum's ledger records who owns what and runs code that can change ownership according to rules nobody can override.
That sounds small. It is the reason almost everything else in crypto exists.
Smart contracts, without the mysticism
A smart contract is a program stored at an address on Ethereum. Anyone can call it. It runs identically on every node. Once deployed it usually cannot be changed, even by the person who wrote it.
The name is misleading. They are not smart and they are not contracts in a legal sense. They are small, stubborn programs that hold money and follow instructions exactly.
Here is what smart contracts made possible:
Stablecoins
USDC and USDT are contracts that track dollars. Roughly the entire crypto economy settles in them.
How stablecoins workDecentralized exchanges
Uniswap is a contract holding two tokens and a pricing formula. No company, no account, no gatekeeper.
How a DEX worksLending markets
Deposit collateral, borrow against it, all enforced by code with no credit check and no loan officer.
DeFi explainedNFTs and ownership
Unique tokens that can represent art, domain names, event tickets or liquidity positions.
NFTs explainedWhat ETH is for
ETH is not just a coin you speculate on. It has three jobs on the network:
- Paying for computation. Every operation costs gas, paid in ETH. Complex operations cost more. This stops anyone from spamming the network with infinite loops.
- Securing the network. Validators lock up ETH as collateral. Misbehave and it gets destroyed.
- Collateral across DeFi. ETH is the most widely accepted collateral asset in decentralized lending markets.
A portion of every fee is permanently burned, which means ETH supply can shrink during busy periods. It is the only major asset with a supply that responds to usage this way.
The switch to proof of stake
In September 2022, Ethereum replaced mining with staking in an upgrade called The Merge. Energy consumption dropped by more than 99 percent overnight, and it was executed on a live network holding hundreds of billions of dollars without downtime. It remains one of the more impressive engineering feats in the space.
Now anyone with 32 ETH can run a validator, and anyone with less can stake through a pool. The staking guide covers how and what the risks are.
Why you will probably use a layer 2
Ethereum's base layer is deliberately conservative. It processes about fifteen transactions per second, and during busy periods a simple swap has cost fifty dollars or more.
The solution was not to make Ethereum faster. It was to build faster networks on top that settle back to it. These are layer 2 networks, and they are where most activity now happens.
| Network | What it is | Typical swap cost |
|---|---|---|
| Ethereum | The settlement layer. Maximum security, highest cost. | Several dollars |
| Base | Coinbase’s rollup. Easiest path from a US exchange. | Well under a cent |
| Arbitrum | The largest layer 2 by value locked. | A few cents |
| OP Mainnet | The rollup whose code many others adopted. | A few cents |
Your wallet works the same on all of them. You are switching networks, not accounts, and the same address works everywhere.
The fair criticisms
Ethereum is genuinely complicated. There are dozens of layer 2s, bridging between them confuses people, and the user experience still asks far too much of a newcomer. Fees on the base layer remain unpredictable. And staking has concentrated meaningfully in a handful of large providers, which is a real centralization concern that the community argues about openly.
Common questions
Do I need ETH to use Ethereum?
Yes, you need a small amount for gas even if you only want to move a stablecoin. This trips up almost every beginner. Newer wallets using account abstraction are starting to remove this requirement.
Is Ethereum better than Bitcoin?
They are built for different jobs. Bitcoin optimizes for being unchangeable, simple and durable. Ethereum optimizes for being flexible and programmable. Asking which is better is like asking whether a safe is better than a workshop.
What is the difference between Ethereum and Ether?
Ethereum is the network. Ether, ticker ETH, is the token used on it. In everyday conversation people use Ethereum for both, and it rarely causes confusion.
Are transactions on layer 2 as safe as on Ethereum?
For rollups, close but not identical. They post data and proofs back to Ethereum, so you inherit most of its security. The differences are real though, and L2BEAT documents exactly what each one's risks are.
Where to go next
Stuck on this one?
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