What are the different classes of motorcycle racing?

Can someone give me the complete rundown on all of them? Country of popularity, kinds of bikes, rules, etc.

I’ve seen five so far, MotoGP, World Superbike, SuperSport, MotoAmerica and WorldSBK.

 

Take it youre only looking for sportbike stuff? Otherwise theres plenty of dirt bike racing too (supercross, gncc, worcs , dakar rally, motocross, etc..)

https://www.dirtrider.com/types-dirt-bike-racing/

 

You need to watch some TT (Tourist Trophy) racing. It's superbikes, but rules and track is a bit different. Isle Of Man TT is some of the most fantastic racing you'll ever watch, it's all on public roads and through towns. These maniacs are doing 180 mph through villages, taking corners with rock walls, power poles, curbs and fences just inches away from their heads. The IOM TT averages at least one death a year, and it's been going on every year since 1907. The race is a sort of time trial, riders leave the start at ten second intervals and best time wins.

The Irish Gran Prix is similar, raced on public roads and just as fast, but the bikes all start together on a grid like other Moto GP does.

I used to ride amateur endurance road races back in the 1980's; they were from 4 to 24 hours long, and you raced in a class according to your bike's displacement. All displacements were on the track at the same time; you had bikes as small as 250cc in Lightweight Superbike, up to 1200 cc in Heavyweight Superbike, all flying around together. Riders were in teams; the short races might change only two riders once during the race; the 24 hour race, we'd change every 45 minutes to an hour all through the race, between four riders. Each team had a scorekeeper, who all sat together and kept track of laps run and time. You got scored for your class, as well as overall, and the big bikes didn't always win the overall.