Depends on the context. If it's described as based on real events, then it likely has some truth to it. But if there's no such indication, it could just be a fictional tale.
Not necessarily. 'Walk in the Woods' could be a blend of real events and creative imagination. The author might have taken inspiration from real walks but added fictional details to make the story more engaging.
It's not a true story. 'A Walk to Remember' is a work of fiction that was written to evoke emotions and tell a compelling tale. The characters and events are imagined by the author.