Bip39 Api Entropy values have to be sourced from a robust supply of randomness. This suggests flipping a good coin, rolling a good dice, sounds measurements etcetera. Do NOT use phrases from guides, lyrics from music, your birthday or steet handle, keyboard mashing, or something you think that is random, https://milomcrhw.worldblogged.com/37345127/bip39-github-the-2-minute-rule-for-bip39