Crypto 101
What Is Cryptocurrency? A Plain-English Beginner Guide
How cryptocurrency and blockchains work, how crypto differs from stocks, and the risks beginners should understand first.
Beginner investing lessons and fake-money practice from the maker of Quoliv.
Quick answer
Cryptocurrency is digital money that runs on a blockchain—a shared record of transactions kept by many computers instead of one bank. Bitcoin was the first. Unlike a stock, most crypto doesn't represent ownership of a business or pay profits, so its price depends mainly on supply, demand, and belief. Prices can swing wildly, and scams are common.
What you’ll learn
- Crypto is digital money recorded on a blockchain, not by a bank.
- Most coins don't give you a share of any company's profits.
- Prices are extremely volatile; 50%+ drops have happened many times.
- Lost keys or scams usually mean the money is gone for good.
- Learn how it works—and practice with fake money—before risking any real money.
This explanation is part of our Crypto lessons path, where you can explore the idea in short lessons and quizzes.
How a blockchain works
A blockchain is a public list of transactions grouped into 'blocks'. Thousands of computers keep copies and agree on which transactions are valid, so no single company controls the record. Once added, a transaction is very hard to change.
You control crypto with a private key, a secret code that proves the coins are yours. Whoever has the key controls the coins.
Crypto vs stocks
| Stock | Most cryptocurrency | |
|---|---|---|
| What you own | Part of a company | A digital token |
| Backed by | Business profits and assets | Mostly demand and the network |
| Trading hours | Exchange hours | 24/7 |
| Typical swings | Moderate to large | Often extreme |
| Protections | Regulated brokers, investor rules | Varies widely, often fewer |
Common types
- Bitcoin: the first and largest, with a fixed maximum supply.
- Ethereum: a network that can run programs, called smart contracts.
- Stablecoins: tokens designed to stay at about $1, but not risk-free.
- Memecoins: joke or hype-driven tokens with very high risk.
The risks to understand first
- Volatility: prices can halve in weeks.
- Scams: fake coins, 'guaranteed' returns, and impersonated celebrities are common.
- Lost access: forget your key or send to the wrong address and it's usually unrecoverable.
- Exchange failure: if a platform holding your coins collapses, you may lose them.
- Rules differ by country and keep changing.
If someone promises guaranteed crypto profits, it's a red flag.
Sources and methodology
This guide was written for education using the primary sources below. It does not evaluate your finances or recommend an investment. Read our editorial policy.