This is on my todo list. I use Docker-compose for it’s simplicity, but Docker is a security nightmare. If you are not careful, it would expose your Nextcloud instance to the whole world. Podman integrates nicely with firewalld which gives me zone based rules. Can’t wait to do this. But I will give sometime to let Quadlet get stabilized and popular.

How would Signal help with zero days?

Signal. Though SimpleX is growing as a superior private messenger.

Desktop = Fedora

Home server = AlmaLinux

Mobile = GrapheneOS

Router = OpenWrt

Your English is perfect. There is no indication of low intelligence from the way you described your issues. B and C grade are pretty average and indicates you can learn with hard work. I think what you might be experiencing is anxiety and that is causing you to think you don’t have skills or intelligence. I am not from US so I don’t know what kind of help might be available for you there, but I would suggest you to look for a job with something you like to do even though the pay might not be great and then eventually your interest will take you further in your career.