As someone who works in IT security every day, I'll echo what others have said:
The password managers recommended by others here are safe and effective. Your password is the encryption key, so even if the password manager company is hacked, it is extremely difficult for a hacker to decrypt your data. Most apps allow you to keep an encrypted copy of your passwords, so it doesn't matter if they go out of business.
Just make sure to pick a long password you'll remember, like Don'tSpendAllDayOnTalkOfTheVillagesDotCom.
Do not use password-protected documents. Not only are they less secure, but they are also less convenient.
-Ken
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