When do you use within and when do you use in in sentences?

Answer 1

There was a whole story within the book. You use it when you want to say that something is inside something else.

Answer 2

Use "in" when referring to an enclosed space or a general location. Use "within" when referring to a specific point or a restricted area within a space. For example, "The book is in the box" versus "The key is within the drawer".