Bip39 Seed. Entropy values have to be sourced from a solid supply of randomness. This means flipping a good coin, rolling a fair dice, noise measurements etc. Do NOT use phrases from publications, lyrics from music, your birthday or steet address, keyboard mashing, or everything you're thinking that is random, https://directoryfrenzy.com/listings12992345/bip39-github-https-linktr-ee-bip39-bip39-options