Don't just read the PDF. Use Foxit Reader, Adobe Acrobat, or Zotero to highlight and add sticky notes. Write questions in the margins: "Why did they use tibia length instead of body mass?" This transforms passive reading into active learning.
, a seminal 2012 textbook (re-released in various digital formats) that serves as a bridge between popular dinosaur books and advanced academic literature. Review: Dinosaur Paleobiology by Stephen L. Brusatte
covers basic biology, such as the fact that roughly 60% of dinosaurs were herbivores. Classification Overview OpenGeology guide