Usually I just remember my passwords, but the program pass is very nice for storing many passwords, calling them in scripts, inserting them from a dmenu prompt and more. Crucially, with the pass-otp module, it can also do Two Factor Authentication (2FA/TFA) AKA One Time Passwords (OTP) where you use a 6-digit-password that changes every half a minute or so. Usually, normies use a cell phone for this, but you can actually just have pass do it on your computer. I actually have a dmenu prompt that gives me a list of all my OTPs to insert, and it automatically generates the six-digit password.
Pass will be in your distro's package repository, but here's the site.
https://www.passwordstore.org/
pass-otp is probably also in your repository, but here is the Github:
https://github.com/tadfisher/pass-otp
Note that I also use the program zbarimg to convert a QR code into text that we can feed into pass-otp. It will be in your distro's package repo too.
Pass uses GPG to encrypt and decrypt your passwords, so I also talk about making a GPG key pair. You can have your GPG unlock automatically on login with pam-gnupg:
https://github.com/cruegge/pam-gnupg
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