QR codes are multi-purpose hand tools that may be found on goods packaging. QR codes have been around for almost two decades, brilliantly developed by a Japanese car manufacturer. Their uses can be as limited as the wide variety of teachers' imaginations that occasionally use them in their classrooms. The data was compiled via narrative and meta-analysis literature reviews. The purpose of this study is to give (1) theoretical background describing what QR codes are and how their use significantly improves classroom teaching. Following this one-on-one chat, there is (2) a preliminary and handson training session and inventive exercises that walk the trainers through the realistic stages of developing URLs and QR codes for classroom usage. The author will then discuss in detail three fascinating practical ideas for using these codes in a variety of ways in the teaching and learning of language skills (reading, listening, speaking, and writing) and language areas (grammar, vocabulary, and pronunciation), including sample projects and beyond. The paper concludes with a systematic analysis of the motivational value that QR codes can bring to the classroom, as well as a serious proposal of a set of fundamental guiding principles for teachers, learners, and researchers who hope to successfully incorporate QR codes into materials, based on the author's experimentation and reflection.