You get a lot of recommendations for Mint here, but I’d like to toss in a recommendation for Pop!_OS. Also based on Ubuntu without all the crap. I would say the biggest difference between pop and mint is the UI, as Mint comes standard with cinnamon and pop with Gnome (soon cosmic) as their DE’s.
Just take a look at those two and choose one of them, they are both great distros, and absolutely the two I would recommend to just about anyone. Easy to use and very straightforward for new people trying out Linux.