Beets is great and it's the primary way I tag music, but it isn't very beginner friendly. Worth learning though.

For something much simpler I recommend EasyTAG: https://wiki.gnome.org/Apps/EasyTAG

>Let the computer do the work

I've had mixed success with this before when it comes to organizing media. Is there any app which takes the middle ground of doing the work but letting the user confirm?