The best Linux for beginners is Debian GNU/Linux. It is, in my opinion, the best Linux for beginners who want to learn as well as experts. It is a stable Linux distribution on which well-known other distributions such as Ubuntu or Kali Linux are based on, still Debian is not a hardcore distribution like Gentoo Linux either.
Personally, I started with Debian Sarge back when it was still testing. Now I’m still working with Debian. In the meantime I’ve tried various other distributions like Ubuntu, Linux Mint, Gentoo, SuSE, Fedora etc., but I’ve always came back to Debian.
