Bip39. use the joined words like a mnemonic sentence. The next table describes the relation among the Original entropy Dependant on your individual scenario, you may choose that on your own, however, you can see why many specialists advocate from placing a passphrase. As seed phrases use normal language words, https://directory-empire.com/listings13118675/bip39-seed-generator-https-linktr-ee-bip39-bip39-passphrase-generator-fundamentals-explained