This is not something I typically use, but I figured some here might have some suggestions. I'm looking for suggestions of apps that would run on iOS and help with security, like saving passwords, generating unique random passwords, etc. I looked around and a lot of it looks to be paid or big tech. I'd really prefer something that's open source and works well.

Needs to be beginner friendly. I'm trying to help a kid grow up a bit and learn to be more diligent about security and not getting accounts compromised all the time like he currently does. Encrypted files backed up on own hardware, etc, etc, etc. like I do is just way over his head.