My "Password Manager" is in my brain, where nobody else can see them.
I keep about 50 passwords, each one with 12-16 random chars... my brain is just not up to that...
You can re-arrange the letters of a website to make passwords. For example, bitcoin.org could turn into n41iR32Rr22141R32Rr221.
The n is from the last letter of the domain.
The i is from the 2nd letter of the domain.
41R32Rr221 is what you memorize, and repeat it twice (with the i inserted into it). This is similarly done for every password. You could also have a number at the end for whether it's an even or odd number of characters in the domain.