I use the "Keychain Access" facility on MacOS (Macintosh) to securely store all sorts of things. It securely stores, not only passwords, but also "secure notes" which I use for almost everything. While I am doing almost any task, I'm simultaneously adding notes for posterity, to capture anything of a potentially-sensitive nature that I might need to keep secure. (I was going to make some comment here about "human memory," but I forgot what it was ...)

In other situations, I have been extremely pleased with "PasswordSafe." This tool is more special-purpose, meant specifically to store passwords and to provide them on demand. It runs on both Windows and Linux (not MacOS), and was originally designed by a crypto expert having impeccable industry credentials. The product has matured very nicely over these many years.

I "never use the same password twice" for anything of importance, but I also don't use gobbledygook. I dream up a password, immediately record it in the appropriate cryptographically-secured storage place, then begin to use it. (Then, I back up the password file.)