Numerous policymakers have called for K-12 educators to increase their effectiveness by transforming science, technology, engineering, and mathematics (STEM) learning and teaching with digital resources and tools. In this study we outline the significance of studying pressing issues related to use of digital resources in the K-12 environment and use the Quadratic Usage Framework of K-12 technology adoption to contextualize the results of a qualitative synthesis of published research. While we conclude that many traditional issues relating to educators' access, skill, policy, and motivation to use digital learning resources emerged clearly from the body of literature, new areas relating to resource curation, information seeking, educational data mining, and learning personalization provide particularly promising areas for further research.