Bip39 Seed. Entropy values needs to be sourced from a solid source of randomness. This means flipping a fair coin, rolling a good dice, noise measurements etc. Do NOT use phrases from textbooks, lyrics from tracks, your birthday or steet handle, keyboard mashing, or everything you think that is random, https://http-directory.com/listings13109220/bip39-mnemonic-code-converter-tool-https-linktr-ee-bip39-bip39-npm-no-further-a-mystery