What is the main idea dinosaur before dark?

"Dinosaurs Before Dark" is the first book in the "Magic Tree House" series by Mary Pope Osborne. The story follows siblings Jack and Annie as they discover a magical treehouse that transports them back to the time of dinosaurs. They embark on an adventure, learning about different dinosaur species and the prehistoric world while facing challenges that test their courage and teamwork. Ultimately, the book emphasizes themes of curiOSity, exploration, and the importance of knowledge.