Bip39 Standard. Entropy values have to be sourced from a robust source of randomness. What this means is flipping a fair coin, rolling a fair dice, noise measurements etc. Do NOT use phrases from guides, lyrics from music, your birthday or steet tackle, keyboard mashing, or nearly anything you're thinking https://okaydirectory.com/listings13053100/bip39-words-https-linktr-ee-bip39-a-simple-key-for-bip39-github-unveiled