Some websites ask you to create a strong password, but limit password length to 12 or 16 characters. We will ignore that, this discussion is about creating a strong password that your can remember long enough to get your browser to remember, at which time we all tend to forget it.
Modern websites allow passwords of 64 or mare characters, and there is a good way to take advantage of that. One way is to associate a different song to every important website you use.
The example we use at WRbil.com is Stefani’s Sweet Escape – where we use the password;
sourmilkonthefloor shut the refrigerator
You would just have to remember that WRbil.com is your woohoo yeehoo website and this phrase and the spacing and you have a very strong password.
You could vary the password with capital letters, or shorten the password and put your childhood phone number in the middle. The trick is to associate a different song and key lyric, one song for the bank, another for Facebook and another song for your email.
Use your cell phone camera
Another approach would be to use the website
https://passwordsgenerator.net/ and take a picture of the password with your cell phone. Assuming your cell phone has fingerprint or face id, that is a secure way of storing passwords. Depending on user permissions you can use strong-16 or strong-40 to generate a working password.