The biggest issue is: no room for error. 1. High entropy: It's best to roll your own dice, think of it like a casino. 2. HTML relies on piles of code, and code = high risk. 3. Offline signing is a must. You can use an offline iPhone or a hardware wallet. 4. Hot wallets are unreliable. The only hot wallets I trust right now are two types: First, Blue Wallet recommended by bitcoinorg, and second, the Web3 wallets from OKX and Binance. Steps: Roll your own dice to generate entropy → Use Sparrow or Bitcoin Core for local address generation and management → Combine with a multi-signature setup → Avoid hot wallets as much as possible.