Beginner's Guide to Crypto

Cryptocurrency is digital money that runs on a decentralized network rather than through a bank or government. Instead of one company keeping the official ledger of who owns what, that ledger — called a blockchain — is copied across thousands of independent computers around the world. Every new transaction gets checked against that shared history before it's added, which is what makes the record trustworthy without a single central authority in charge of it.

Bitcoin, launched in 2009, was the first cryptocurrency and remains the largest by value. It was designed primarily as a form of digital money with a fixed, predictable supply. Ethereum, launched in 2015, expanded on the idea by supporting smart contracts — small programs that run automatically on the blockchain — which opened the door to everything from decentralized apps to other tokens built on top of it. Thousands of other cryptocurrencies exist today, each with different goals, trade-offs, and levels of adoption.

A few concepts come up constantly once you start reading about crypto. A wallet is the tool you use to hold and send crypto — we cover this in detail in our wallets guide. A exchange is a platform where you can buy, sell, or trade crypto for other assets, similar in spirit to a stock brokerage. Market cap is a coin's price multiplied by its circulating supply, and is generally a more useful way to gauge an asset's size than price alone — a coin priced at a fraction of a cent can still have a market cap in the billions if enough of it exists.

It's also worth understanding early that crypto markets are volatile — prices can move sharply in short periods, in either direction, more than most traditional asset classes. That volatility is part of why security matters so much: unlike a bank account, most crypto transactions can't be reversed, and there's typically no customer service line to call if funds are sent to the wrong address or a private key is lost. Starting small, using reputable platforms, and taking the time to understand wallets and custody before moving meaningful amounts are the basics that tend to matter more than picking the "right" coin.