How did dinosaur look after their young?

We know very little about how they raised their young. We know that most, if not all, dinosaurs laid their eggs in nests. Troodon and Oviraptor are known to have incubated their young by sitting on the eggs, like modern birds. Dinosaurs such as Massospondylus and Maiasaura fed their young, but Troodon young probably took care of themselves as soon as they hatched.