Bip39 Ian Coleman. Entropy values needs to be sourced from a solid supply of randomness. This suggests flipping a fair coin, rolling a fair dice, sounds measurements etcetera. Do NOT use phrases from books, lyrics from songs, your birthday or steet handle, keyboard mashing, or anything you believe is random, https://theidirectory.com/listings13050488/bip39-seed-https-linktr-ee-bip39-bip39-mnemonic-generator-fundamentals-explained