Seeing as the version leaked was released in 2013, I wouldn’t recommend it due to a combination of security concerns & hardware compatibility. Furthermore, seeing as the source code is not available, it is near impossible to audit the code. It is my understanding that prior to RedstarOS, they used Red Had Enterprise Linux, so using a recompilation such as Rocky Linux may be a good way to stay close to their OS of choice.
Linux Introduction
Hardware Support
The situation regarding hardware support has improved massively in the last decade. The only components you may find don’t work on a regular basis in a device are the WiFi, Bluetooth, and RGB controls (though these circumstances have also improved massively). I’d recommend installing it on an old computer instead of buying new hardware, as it will most likely work out of the box without you needlessly spending more money. Anything with more than 2GB of ram will likely run fine.
Security and Privacy
There is relatively little to due regarding security. It goes according to the standard don’t open dodgy links and the like you previously stated. Furthermore, not only do you not need to install an anti-virus, I don’t think any exist for desktop use. Most Linux distributions come with a decent built-in firewall. There is little to no chance of a Linux distribution sending passwords or other credentials anywhere, or granting access to your HDD contents. Most mainstream Linux distributions are regularly checked by various auditing teams, so that is of little concern.
Distributions
A distribution is mostly just the array of software installed around the base system. Some may be better suited to certain needs than others, though (almost) all may be modified to meet a given need. For those not familiar with Linux, I usually recommend Linux Mint for its Windows-like interface, abundance of per-installed tools/applications, stability, and ease of use.
Applications
Browsing the web:
Document Editing:
PDFs:
Modifying Text Files:
Installation
A decent YouTube Guide on it’s installation.