>How do we know what foods they ate?
Can’t answer the first two, but we can have a general idea on what animals eat based on their teeth, predators often have sharp teeth, which are good to catch prey and to tear the flesh, herbivores usually have flat teeth that are well suited to grinding plant matter so it’s easier to digest (remembering that cellulose is really hard to digest if you don’t have some level of bacterial helping, or cooking).
On the other hand it’s much harder to know what they ate *specifically*. Sure, we know x dinosaur was a herbivore, but not exactly what they ate. However some times paleontologists find specimens with discernible stomach matter, like [this one piece of news from 2020](https://www.nhm.ac.uk/discover/news/2020/june/dinosaur-diaries-fossil-stomach-reveals-last-meal.html), which can give more insight on what given species in a given place would eat.
Edit: The joke answer: you can learn [how dinosaurs used to hunt in the past](https://youtu.be/rGOYi8BLstA) by watching the latest One Piece arc.
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