First, the two names.
Ethereum is a blockchain network. Ether, usually shortened to ETH, is its native asset. You can think of Ethereum as the shared system and ETH as the asset that pays for work on that system. They are connected, but they are not interchangeable terms.
A useful first step is to separate the network, the assets, and the applications. A wallet is an interface for an account. A token is an asset represented onchain. A block explorer helps you read public records. Keeping these ideas separate makes the rest much easier.
What is actually onchain?
Transactions record activity. Blocks group transactions together. An address identifies an account. Smart contracts are programs deployed on a blockchain. An explorer provides an interface to look through these records without asking you to sign a transaction.
Start with the Ethereum block explorer. Search a public address and pay attention to the network, the transaction status, and the destination. Reading is different from interacting: a lookup does not move assets.
The one-line version.
Ethereum is the network. ETH is the native asset. An explorer is a window into the public record.
ETH and Ethereum tokens are different.
ETH is not an ERC-20 token. ERC-20 is a standard that lets compatible applications use a common interface for fungible tokens. Wrapped ETH, or WETH, is an ERC-20 representation of ETH. Other tokens can have very different purposes and risks.
A familiar name or logo does not identify a contract. Use a project's original documentation to check the network and full address before relying on a listing. Our token directory includes source links so you can keep investigating.
Take a small, practical next step.
Open an explorer, read a transaction, and write down three things you understand and one question you still have. Then try the gas calculator with clearly labeled example inputs. You do not need to buy anything to learn the vocabulary.