A crypto "wallet" is one of the most misleading names in the entire industry. It doesn't store your coins the way a physical wallet stores cash. Your cryptoassets exist as entries on the blockchain itself; what a wallet actually holds is your private key — a secret piece of data that proves you control a specific address and lets you authorise transactions from it.
This distinction matters because it reframes the whole security question. You're not protecting "coins" from theft in the traditional sense — you're protecting a secret that grants control. Anyone who obtains your private key, or the seed phrase that backs it up, can move everything that address holds, instantly and irreversibly, with no bank to call and no chargeback process.
Wallets broadly fall into two camps. A hot wallet is connected to the internet — an app on your phone, a browser extension — which is convenient for everyday use but has a larger attack surface, since it's reachable remotely. A cold wallet keeps your private keys offline entirely, typically on a dedicated hardware device, making it far more resistant to remote hacking at the cost of being slightly less convenient. Most experienced users split their holdings: a hot wallet for small, everyday amounts, and cold storage for anything they want to keep safe long term.
There's also a distinction worth knowing between custodial and non-custodial wallets. When you hold crypto on an exchange, the exchange controls the private keys on your behalf — convenient, but it means you're trusting that company to keep your funds safe and to let you withdraw when you want to. A non-custodial wallet puts you in direct control of your own keys, with the independence (and full responsibility) that comes with it. Neither is universally "better" — they're different trade-offs between convenience and control.
Whichever setup you use, one habit matters more than any other: protect your seed phrase. Write it down, store it offline, and never type it into a website, app, or message — no legitimate service will ever ask you for it. Losing it, or having it stolen, is the single most common way people lose everything in their wallet.