Your online security is very important, more so when your are logging into a service I’ve setup for you!
I understand that remembering different passwords is a nuisance (or impossible), which is why I don’t.
I remember one password, a really good long one, if you’re a client of mine you will be bored by me moaning on about it, so here are two solutions: 1) write them all down meticulously and put that book in a secure safe bolted to your home (preferably fireproof). 2) Use a Password Management System.
Below is a list of the top 5, as rated by various users on various groups, personally I recommend Lastpass.
Worth noting is that most of them are free, often with premium options like mobile apps.