Bip39 Passphrase Optional Entropy values has to be sourced from a strong supply of randomness. What this means is flipping a good coin, rolling a good dice, sound measurements etc. Do NOT use phrases from books, lyrics from music, your birthday or steet tackle, keyboard mashing, or anything at all https://codypakuf.blue-blogs.com/38389697/bip39-standalone-an-unbiased-view-of-bip39-word-list