Comment by sandreas

I'd suggest Mint or Fedora. Mint is more beginner friendly / windows-ish, Fedora is more modern and polished.

In general Linux user exp. is more about Desktop environments than Distribution. The "what's under the hood?" question is not important as long as YOU are responsible for the maintenance (installing apps, backups, updates, etc), so you could even go NixOS, Arch or Gentoo, if you'd like. I'd also recommend to add an invisible automated backup (syncthing or restic+hetzner storage box).