This document discusses how to create and use QR codes in classrooms and libraries. It begins with an introduction of the author and their experience using technologies like QR codes. It then provides information on what QR codes are, how to generate and read them, and various ways they can be implemented in educational settings like linking to supplemental materials, conducting scavenger hunts, and organizing information for students and parents. Specific examples are given of how the author uses QR codes at their school library, such as linking books to additional online resources. Instructions for creating QR codes using various free online tools are also included.