DeletedUser632 What is the next best after GrapheneOS and what is the recommended configuration?
When it comes to security and privacy on mobile devices, the alternative to GrapheneOS is iOS on an up-to-date iPhone, but I objectively think that GrapheneOS is the best option for mobile devices, so there isn't really any other configuration as good as this one available to the general public. There was previously DivestOS, which was a great project aimed at minimizing the attack surface of devices considered insecure, but the project has since ended.
On desktop, the security model is largely flawed. macOS fares a little better, and Windows 11 isn't too bad an option, but there are a lot of bullshit, mainly in the Home version, which you can't revoke. Secureblue.dev is a solution for Linux desktop and Linux server that aims to reduce the insecurity of Linux, It's a great project, but the desktop security model is still problematic, that hasn't changed. You should also familiarize yourself with threat models.