Yes, the main idea of the book "Hatchet" by Gary Paulsen is survival in the wilderness. The story follows Brian Robeson, a 13-year-old boy who is stranded in the Canadian wilderness after a plane crash. With nothing but a hatchet to his name, Brian must learn to survive on his own in the wilderness, facing challenges such as finding food, water, and shelter, as well as dealing with dangerous wildlife and harsh weather conditions.
Throughout the story, Brian learns valuable lessons about self-reliance, perseverance, and the importance of adapting to new situations. He also comes to appreciate the beauty and power of nature, and gains a deeper understanding of his own strengths and weaknesses.
Overall, the main idea of "Hatchet" is the theme of survival and the human spirit's ability to overcome adversity in extreme circumstances.