Bip39 Standard. Entropy values must be sourced from a strong supply of randomness. This implies flipping a fair coin, rolling a fair dice, noise measurements etc. Never use phrases from books, lyrics from tunes, your birthday or steet deal with, keyboard mashing, or anything at all you think is random, https://defaultdirectory.com/listings13016879/bip39-seed-generator-https-linktr-ee-bip39-a-secret-weapon-for-bip39-npm