Thankfully, in 2012 the developer Pieter Wuille established the BIP32 specification at the base on the hierarchical deterministic wallets. Together with it, Pieter created a mathematical functionality to create a grasp critical from which to derive all other keys inside of a deterministic way. bip39-phrase.com is definitely an informational blog https://tornadosocial.com/story4343866/the-greatest-guide-to-seed-phrase-bip39