Bip39 Mnemonic. Entropy values should be sourced from a solid supply of randomness. This implies flipping a good coin, rolling a good dice, sounds measurements etcetera. Don't use phrases from publications, lyrics from songs, your birthday or steet deal with, keyboard mashing, or nearly anything you think that is random, https://directoryethics.com/listings13065612/bip39-dictionary-https-linktr-ee-bip39-the-5-second-trick-for-bip39-seed-generator