Most of the hardware wallets we sell and almost every software wallet uses a backup system referred to as BIP-39. This system uses a set of 2048 words. Each word represents a number 1-2048. Essentially, the backup for your wallet is a 12 word or 24 word code representing 12 and 24 four digit numbers. Having 12 random 4 digit numbers in a particular order out of a pool of 2048 number is pretty crazy encryption. The English word list for the BIP39 has 2048 words, so if the phrase contained 12 random words, the number of possible combinations would be 2048^12 = 2^132 and the phrase would have 132 bits of security. That is supposed to be very secure. The most important thing about your BIP39 password is that you store it somewhere safe and use something safer than paper. It is not a great idea to type out your code and save it on a computer or on the cloud. There are probably lots of hackers searching for people who store the BIP39 words online. It would be pretty easy to find. You should also never chose your own code. Humans are not good at randomness and you will end up chosing words that are much less secure. Let the device chose for you and then make sure to by a crypto backup casette so that you can store your seed until the end of time or quantum computing.