Nobuaki Ushijima, "Don Quixote's Journey" - Read this and you will find Don Quixote interesting! The best introductory book that I highly recommend!
This book is really great. It makes "Don Quixote," which tends to be a struggle after just one reading, into something completely different. It is such a great transformation that it is no longer funny and interesting.
Don Quixote" is a parody. It is not interesting unless you can see behind the scenes of what appears on the surface.
This book explains the fun of "Don Quixote" in such a vague way that even if you read it vaguely, you will not first notice it.
This book is a good place to start. I recommend it with confidence. It is such an interesting introduction to the subject.