I keep my log-in info on a single sheet document right next to the keyboard. Safely, as it is encoded.

Different sites have different password rules.
The passwords need to be different for each site in the event one of the sites is hacked.
So I started the list of one line entries that is currently almost a page long.
The front end of the password is to meet the varying - caps, lowercase and symbol requirements and the common ones are partially abbreviated on the list.
The second part is one of my 5 standard "patterns" to meet length requirements and is represented by a single symbol that reminds only me.

This system keeps me from having to remember 40+ unique passwords and user names. I'm 63 - ain't gonna happen

Things that can cause real financial pain like my bank and IRA funds are not on the list and do not use any of the patterns from the list.