The proper solution to this is to use a password manager like 1Pass. About $36/year. A free alternative is BitWarden, which also has an inexpensive paid version. There is a good overview on NYT's "Wirecutter" here.How do you keep track of them?
How many do you have?
Do you change them?
I have so many now, that I have a book for them. I don't change them like recommended, and I do not store them on the internet. I suppose I ought to boil it down to a few
With a password manager, you can store an unlimited number of passwords, and generate a password of any length or complexity. I've been using LastPass for a few years but will prob. switch to 1Pass next year.
Here's a sample password I just asked LastPass to create. You can specify the length and complexity:
Password managers are available for all platforms. You can also (and should) export the password file so you can keep a copy on a spare drive. You just need to create a good master password to log in to the manager, which you only need to do if you have logged out or shut down your computer/mobile. Often recommended is a phrase you can remember, like "I was Maggie_Thatcher's 1st denturist"

Using simple passwords like, say "357 Registered Magnum" may be OK for sites like this, but bank accounts, social media and such need a higher level of protection these days. For better or worse, "we're not in Kansas any more."