Were they fluffy or slightly feathered?
Dinosaurs are so different to what we thought growing up - green rubbery things
Depends on the species honestly. The further away you get from birds evolutionary speaking they simpler the feathers get.
Stuff like raptors more or less had a fully bird like coat of feathers. In contrast something like sinosauropteryx who is more distantly related had more fur like plumage
Or do you mean the extent of feathering? That also depends on the species, as the main function for most dinosaurs feathers was the same a fur in mammals: For keeping warm. So similar as mammals the bigger you are and the warmer your environments climate is the more you are at risk of overheating.
So Tyrannosaurus for example was enormous and lived in a warm environment, so it in all likelyhood was more or less naked as an adult, whereas Yutyrannus (a cousin from asia) was a tad smaller and lived in a pretty cold region, so it was covered from head to toe in fluff