Take a photo of a barcode or cover
Edith Hamilton's Mythology covered the bases very well of what everyone who wants a basic knowledge of the gods of Greek/Roman mythology and also of all the major heroes and epic stories. Almost everything is covered in a basic format and much of what I know of Greek mythology came from this book. I felt like the descriptions of the gods were a bit dry at times, but once it went into the heroes and summaries of some of the classic stories like Perseus and Medusa, the feats of Hercules, the Iliad, the Aeneid, and the Argonautica it really sparked my interest. This is a book that everyone should read if they lack knowledge of Greek Mythology.