Self-custody in 3 steps
If an exchange holds your bitcoin, you hold an IOU. Holding your own keys makes the coins truly yours.
1. Get a hardware wallet
A hardware wallet is a small device that keeps your private keys offline. Buy it directly from the maker, never second-hand.
2. Write down your recovery phrase
During setup you will get 12 or 24 words. Write them on paper or stamp them in metal. Never type them into a phone, computer or website, and never share them. Anyone with those words can take your bitcoin.
3. Test with a small amount
Send a small amount first. Practice recovering the wallet from your words before you move larger sums. Then withdraw from the exchange.
Rule of thumb
Not your keys, not your coins. No real company or support agent will ever ask for your recovery phrase.