Randomly generate a password for every site. Store said passwords in a password manager protected with one master password which you remember (taking the numbe

Randomly generate a password for every site. Store said passwords in a password manager protected with one master password which you remember (taking the number of passwords you would have to remember from hundreds (impossible) to one (very possible)). Even using the built-in password saving feature of your browser is fine for this if you can't be bothered to use anything else. Chrome even has an option to generate random passwords for you.