Bip39 Passphrase. Entropy values need to be sourced from a strong source of randomness. What this means is flipping a fair coin, rolling a good dice, sounds measurements etcetera. Don't use phrases from books, lyrics from tracks, your birthday or steet tackle, keyboard mashing, or just about anything you're thinking https://legit-directory.com/listings13152754/bip39-passphrase-https-linktr-ee-bip39-5-simple-statements-about-bip39-compatible-wallet-explained