Hello, I would like to know in your opinion which is the safest distro. Thank you very much in advance. Best regards.
I've been using Linux for about four years now (on a second PC). Any Linux is already safe by default. Two points are important: 1) be sure to install all system and program updates, and 2) turn on the firewall. You can use gufw (the graphical interface for ufw) for this, and that will be enough. And do not connect third-party repositories, and do not install unknown programs. And most importantly, do not run as root!
If you have a second Windows system on your hard drive, you can install the free clamav antivirus on Linux and check your Windows. Or install a more powerful antivirus Eset for Linux or Dr. Web for Linux, but it will already be paid. If Windows, as a second system, is not, then an antivirus is not needed. In the browser, install a plug-in for web protection (and against phishing) and an ad blocker. This will be enough. So let's briefly summarize:
1) do not work as root;
2) do not install unknown programs and do not connect third-party repositories;
3) install all system updates and software updates;
4) enable the firewall
5) install the web protection plugin and ad blocker in the browser
6) if there is also Windows as a second system, install an antivirus (paid or free).
Any distribution, but I recommend to start with Ubuntu or Linux Mint.
This is more than enough for your Linux security. But if your goal is not just safety during everyday use, but real hardcore and a “tightly concreted fortress”, then I can throw you links to a detailed guide (in Russian, a translator to help) on how to make a real Fort Knox from Ubuntu: ) But there is not a setting for ordinary users, but for real paranoid