From leaving Bitcoin on exchanges to ignoring fees, these are the most common and costly mistakes new Bitcoin buyers make — and exactly how to avoid each one.
Buying Bitcoin for the first time is exciting. It's also easy to make decisions that cost you real money or put your investment at risk. After reviewing dozens of exchanges and talking to hundreds of Bitcoin buyers, these are the five mistakes we see most often.
Mistake #1: Using an Unregulated Exchange
The cryptocurrency space has a long history of exchange failures — Mt. Gox, FTX, Celsius, and dozens of smaller platforms have collapsed, taking customer funds with them. The common thread: they operated with minimal regulatory oversight.
US-regulated exchanges like Coinbase, Kraken, and Gemini are licensed as money services businesses, hold customer funds in segregated accounts, and carry insurance on digital assets. They're not risk-free, but they operate under legal frameworks that provide recourse and oversight.
Mistake #2: Not Enabling 2FA Immediately
SIM-swap attacks — where a hacker convinces your carrier to transfer your phone number — are the most common way exchange accounts get compromised. If your account is protected only by SMS 2FA, a successful SIM swap gives an attacker everything they need.
The fix is simple: enable authenticator app 2FA (Google Authenticator, Authy, or 1Password's TOTP) instead of SMS. Authenticator codes are generated locally on your device and cannot be intercepted via SIM swap. Do this the moment you create an exchange account, before you deposit anything.
Mistake #3: Buying Bitcoin with a Credit Card
It's tempting — especially when Bitcoin is rising — to max out a credit card to buy more. This is almost always a mistake, for two reasons. First, most credit card issuers treat crypto purchases as cash advances, triggering immediate interest charges (often 24–29% APR) with no grace period. Second, buying a volatile asset with borrowed money amplifies losses: if Bitcoin drops 30%, you still owe the full credit card balance plus interest.
Use cash you can afford to lose. Link a bank account or debit card. Never borrow to buy Bitcoin.
Mistake #4: Leaving Large Amounts on an Exchange
"Not your keys, not your coins." This saying exists because exchanges can and do fail, freeze withdrawals, or get hacked. When your Bitcoin is on an exchange, the exchange controls the private keys — and therefore your Bitcoin.
For amounts you're actively trading or plan to sell soon, keeping Bitcoin on a regulated exchange is acceptable. For anything you're holding long-term (weeks, months, years), withdraw to self-custody: a hardware wallet where you control the keys. A Ledger Nano S Plus or Trezor Safe 3 costs $79 and provides institutional-grade security for your holdings.
Mistake #5: Panic Selling During a Drawdown
Bitcoin has experienced multiple drawdowns of 50–80% during its history. Every single time, it has recovered and reached new highs — but that recovery took months or years, and investors who sold at the bottom locked in permanent losses.
The antidote to panic selling is position sizing: only buy as much Bitcoin as you can hold comfortably through a 50% drawdown without needing to sell. If a 50% drop would force you to sell due to financial pressure, you've sized your position too large. Bitcoin's volatility is the price of admission — accepting that in advance is what separates long-term winners from those who sell at the bottom.