" 2519 " was a novel about a fictional story that had nothing to do with the real world. The inspiration for this book came from the author's imagination rather than real events. In the novel, you can experience the feelings and thoughts that the author wants to express, but the characters and events in the story are fictional and have nothing to do with the real world.
It depends. Sometimes a true story can be exaggerated or have some details changed for dramatic effect, but the core events are often based on real happenings.
It's a bit complicated. A true story might be mostly true, but details could be changed or interpreted differently. Plus, people's experiences and recollections can vary, affecting the accuracy.