River, Strike, or Swan to buy. Withdraw up to $500 to a bitcoin only, open source hot wallet like Blue Wallet, Sparrow, or Electrum. Past $500, get a bitcoin only open source hardware wallet for cold storage: coldcard, bitbox, or blockstream jade.

Check out BTC Sessions on YouTube for cold wallet tutorials.

Write down your seed phrases on paper or stamp on metal. Never put seed phrase in any digital format. Keep strictly offline.

For non-KYC bitcoin, bisq or robosats