+1 vote for 1Password.
(Yes, they have a free trial!)
1Password (from AgileBits) is an awesome tool. Very easy to get started, and once you get used to knowing that you have a safe place to find all your passwords, usernames, safe combos, credit card numbers, software install codes, and other important bits of personal data, you'll feel a peaceful easy feeling.
As a computer consultant for 20+ years, I have to securely, safely & quickly manage over 3,000 passwords, alarm codes, safe combos, credit cards, and other secret bits, many of which do not belong to me. I plan to NEVER need to apologize to a client for mishandling their secret passwords or alarm codes.
I have tried several password managers, and I have used 1Password for well over 10 years. It really is great. Easy to use, safe & includes a bunch of advanced features you can get into later if you want to. Including encrypted cloud backup which is fantastic if anything happens to your phone or computer.
To address your concern; "What if someone gets into my password manager, then they have my everything?"
I do recommend using a sort of long password for the 1Password app, to prevent someone ever cracking into that. It is the "1 Password" that you do need to memorize. But the the bad guys would have to first break into either my DropBox or my iCloud, or get hands-on access to my phone or computer before they can even begin to start guessing passwords. It's the very unlikely event that is necessary before the other very unlikely event can even begin.
So I'm saying that if you have a good password for your password manager, that having a password manager (like 1Password) is far far better & safer than not using a password manager. It's important to focus on the actual risks without ignoring the other risks & costs. If you are not using a password manager you may be doing some risky behavior in the name of "simplicity". Such as reusing passwords, or writing them down somewhere that is not as safe as you think it is. Or only writing down the password, neglecting the username, website uRL, or security questions. Yes, modern life can be crazy.
And losing your simple password list is a danger too! Especially since it is not encrypted as a good password manager would do. Not only do you need to worry about bad guys getting your passwords, you need to be concerned about you not having all your passwords. There are many perils; burglars, internet hackers, fire, flood, pandemic. A quality password manager does greatly mitigate the risk of all of those.
And of course, some best practices:
Definitely use a different username and password for every different thing.
Passwords longer than 13 characters are better. Even longer is even better.
Store your password in a safe format (encrypted).
Use quality tools that help you work better, stay organized & calm.
Remember that email is the master key to all your other stuff. So protect & change your email password occasionally.
Remember to only download software from the correct website! Usually that is the software manufacturer's website.
If you fail to plan, you plan to fail.
Thank you for all the info. Something I have been lax on and need to improve.