I read a lot of posts on this topic. People offer any, even fantastic options. Each of them has advantages and disadvantages.
I found a simple and understandable solution. We have Private Key, for example
ch74nhcwrf4439nfv340fvq3rvn23mf2fj20f204f
You can leave it on the computer + print and put somewhere at home + make another copy on the email.
It is necessary to do only one thing. Change 4-6 characters.
For example, change ch74nh to krw49d Further, it is enough to remember these 4-6 characters.
Now if a hacker gets access to your computer and finds a Private Key, he can not steal money.
But we can do even better. Replace characters not at the beginning of the Private Key, but somewhere in the middle. For example, the date of birth your wife on 12 December. You definitely will not forget this date. We change the symbols from 12 to 17.
Its a bad idea because 4-6 letter is not easy to memorize specially if you are not using it daily. Remembering the date of your birthdate is easy to recall but private key that is given by the system is not easy to recall because it is random. Imagine that there are people who forgot their password on their email or any account that needs password because they seldom use it.