Obviously this is not for seed phrases. Just for regular login/password info.
I installed KeePass, and it looks fine. But I don't need the complexity of a database format, I just want a simple text file (or similar) that I can put my passwords in, and lock with a master password, like KeePass does. I'm not very familiar with what's out there.
What's a simple option?
gpg --symmetric <file>?veracrypt can give you a encrypted usb stick. you can create whatever file system you want on it
https://www.passwordstore.org/
With 7zip (and most compress software) you can encrypt it and put a password on it.
Actually apparently you can actually add a file as an attachment in KeePass.
https://keepass.info/help/base/faq_tech.html#rtftext
That looks straight-forward, I'll probably stick with that unless someone has a better idea.
Best thing you can do is keep things familiar, so this is probably your best option