Every time a big company is hacked, like when Yahoo got hacked in 2016 and exposed the personal info of over 1 billion accounts, experts tell us to stop trying to memorize all of our password and to use a password manager instead. A password manager is basically a virtual safe where you can safely store all of your passwords. Since when you use a password manager you don't have to remember every single password anymore, you can make them really long and complicated. Your passwords are also encrypted so even if your password manager gets hacked, all of the individual passwords stored within are safe from hackers.
Source: Vox
Source: Vox