Oh god, I think that’s almost impossible, I could recommend more than a dozen categories of motorsports, but I feel that would be super tough for someone that hasn’t gotten in to it at a younger age.
I think for a newbie, I would recommend MotoGP. There’s rivalries, the racing usually tends to be fairly close and good for the win (and up front), which also happens to be the place where you have the riders with all these rivalries. Also, because they’re motorbikes and not cars, they don’t suffer from the same things that a Formula 1 car does for example. Also a race tends to last for about 45-50 minutes usually, so it’s not the longest watch out there compared to other series out there.
Also…can I just say as a random tangent, the ease of how this site works and the way you get notified is phenomonal lol