I have a document “on the cloud” with that information. That way I only have to remember one password to get access to all the passwords, and it’s a lot of passwords, let me tell you. Pages and pages of them. I’m afraid about whether this is secure enough, but it’s the best thing I’ve been able to come up with so far. If someone did hack it, would they know what company, town, country, etc. the passwords belong to? Hopefully not…
I also use a similar system to what kc5jck brought up – parts of the passwords remain consistent so there is less to memorize. (Not that I succeed in memorizing much). I will try to remember once or twice, but then look it up. It is oh so embarassing to get locked out when you are supposed to be the “expert.” Luckily, I can access my password document via smartphone even when I’m in the field.
Fun idea – I use words I don’t know how to spell as passwords – then, by the time I have to change the password again, I’ve learned to spell a new word – Yes, I like to torture myself 