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Crypto in five questions.

Lesson 1 / 5

What is cryptocurrency?

Cryptocurrency is a digital asset that uses cryptography to help secure transactions. On networks such as Bitcoin and Ethereum, participating computers maintain a shared record instead of one bank maintaining the ledger. Different assets have different purposes: payments, network fees, or use within applications. Buying a cryptocurrency does not automatically give you shares in a company.

For example: Sending ETH to another address changes the network’s record. The recipient can see the transfer using a wallet or a block explorer.

Remember: Start by asking what the asset does and how its network works.

Further reading: Ethereum.org — What is Ethereum ↗

Lesson 2 / 5

What is a blockchain?

A blockchain is a shared record organized into linked groups called blocks. Network participants check transactions against agreed rules. In Bitcoin, confirmed transfers become part of this record, allowing wallets to determine which funds can be spent. The links between blocks help make rewriting earlier history difficult.

For example: Think of a shared notebook with numbered pages. A new page refers back to the previous one; changing an old page disrupts the chain.

Remember: The blockchain is the record; it is not the same thing as a wallet.

Further reading: Bitcoin.org — How Bitcoin works ↗

Lesson 3 / 5

What is Bitcoin?

Bitcoin is a network for transferring digital value, and BTC is its asset. Wallets use private keys to authorize spending. Transactions are broadcast to the network, and miners put them into blocks that other participants verify. You can use Bitcoin without understanding every technical detail, but understanding custody is essential.

For example: A wallet signs a transfer; network participants verify it. The wallet does not send a physical coin.

Remember: Bitcoin combines an asset with a network that verifies transfers.

Further reading: Bitcoin.org — How Bitcoin works ↗

Lesson 4 / 5

What is Ethereum?

Ethereum is a blockchain network that supports transfers and programs called smart contracts. Its native asset is ether, usually written as ETH. Smart contracts allow developers to build applications and create other tokens. Ethereum is the network; ETH is the asset used to pay for activity on it. An application running on Ethereum can still have bugs or other risks.

For example: An application can use a smart contract to carry out a token exchange according to programmed rules.

Remember: Ethereum is a programmable network. ETH and Ethereum are related, but the names refer to different things.

Further reading: Ethereum.org — What is Ethereum ↗

Lesson 5 / 5

How are Bitcoin and Ethereum different?

Both are public blockchain networks with native assets. Bitcoin centers on transferring digital value. Ethereum also supports a broad ecosystem of smart contracts and applications. BTC belongs to Bitcoin; ETH belongs to Ethereum. Their networks, fees, and wallet requirements differ, so you should not assume that an address or service supports both.

For example: An app may charge a fee in ETH to interact with an Ethereum smart contract. That is different from making a BTC transfer on Bitcoin.

Remember: Learn the network and the asset separately. Understanding the difference is not a recommendation to buy either.

Further reading: Ethereum.org — Ethereum and smart contracts ↗

Wallets, keys & recovery.

A wallet helps you use your account. The keys authorize transactions; the wallet interface displays balances and prepares actions. Understand who controls the keys before choosing how to hold assets.

Explore Ethereum.org's wallet introduction ↗

Test your understanding.

THREE QUESTIONS / JUST FOR LEARNING

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Learn at your own pace

Straightforward lessons for people who want to understand Bitcoin, digital assets and online security. Start with the fundamentals, then build practical skills.

Bitcoin Fundamentals

Learn what Bitcoin is, how transactions work, why private keys matter and how to think critically about custody.

Wallets and Self-Custody

Explore wallet types, seed phrase safety, common mistakes and ways to reduce avoidable risks.

Crypto Security

Understand phishing, scams, exchange risks, device security and basic privacy practices.

Test your knowledge

A free Bitcoin knowledge quiz and structured courses are in development. Lessons and assessments will be added here as they are ready.

Our approach: clear explanations, real examples and no promises of investment returns.