This URL is from 24 April 2020. We rewrote it in August 2026 so it would not read like a 2017 token-sale explainer, and expanded it in October 2026 so a bookmark is enough for a first read. The longer pillar is Ethereum without the jargon. Use that when you want gas, tokens, and approvals in more depth. This page is the machine and the mistakes.
What Ethereum is
Bitcoin is mostly a ledger of who can spend which coins. Ethereum is a ledger that can also follow instructions. Those programs are called smart contracts. They are not wise, and they are not legal contracts. They do what the code says, including the bugs, if you pay the fee. Thousands of computers keep the same record. Nobody has a helpdesk that can undo a confirmed call because you clicked the wrong button.
Ethereum accounts are addresses with a running balance, not Bitcoin-style notes. One address can hold ether and a pile of tokens at the same time. That convenience is also how one leaked phrase loses all of them.
What ETH is for
Ether (ETH) is the native asset. You use it to pay for computation, which the network calls gas. You can hold ETH and never touch an application. If you choose, you can also lock ETH to help secure the network. That is staking: a lock and a queue, not a savings account. Since the Merge in 2022, Ethereum does not use mining. A leftover proof-of-work coin with a similar name is a different network.
You do not need to “upgrade your ETH” when the protocol upgrades. Pectra in May 2025 changed what accounts and validators can do. Your coins did not expire. New prompts that appear the same week are not automatically official. A wallet signature is not a handshake.
Tokens are not ETH
A token is a balance inside a contract. The wallet displays it with an icon. That is not the same as ETH, and it is not automatically safe because it is on Ethereum. Copycats reuse tickers. Unlimited token approvals let an application pull tokens later. They are convenient for the app and convenient for whoever controls the app tomorrow. Revoke approvals you do not use. Ignore surprise tokens; they are often bait.
Dollar-tracking tokens, NFTs, and liquid-staking receipts can all sit beside ETH. Stablecoins: useful, not magic. An NFT is a receipt on a chain, not a painting in a vault. Mixing them up at the send screen is the ordinary injury.
Fees jump for a boring reason
Block space is limited. When many people want the machine at once, they bid up gas. A failed transaction can still cost gas, because the machines tried. Quiet Sundays are cheaper than busy afternoons. That is demand, not a personality trait of the chain. On-chain fees are an auction.
Layer-2 networks batch work and post it back to Ethereum, which lowers fees. They are related to Ethereum, not identical. Your wallet may show the same address characters on Ethereum, Arbitrum, Optimism, and Base. The funds are still in different notebooks. Sending to the right characters on the wrong layer is a common, painful mistake. The wrong network is still the wrong city.
A calmer next step
Learn addresses and networks first. Practise with an amount that would only annoy you. Type official URLs yourself. Keep the recovery phrase offline, and test a restore while the balance is zero. Read Ethereum without the jargon before you treat an application homepage as a tutorial.
This page is information, not a recommendation to buy ETH, to stake, or to use any particular app.
