The present review intends to show the current state of teaching quantum-related content, to analyze and compare its learning efficiency, and to give a systemized overview of quantum-educational activities in the last years. We focus on teaching and learning elements, their innovative tools, and process-oriented studies that are empirically validated. In terms of content, we mainly concentrate on aspects of modern quantum technology. The final dataset for our analysis and synthesis included 50 studies published since 2017 and until the follow-up survey in February 2024. We have found that most of the teaching strategies described and investigated are in the field of quantum mechanics and are designed to provide an introduction to the rather broad and differentiated topic of quantum science. Studies specifically addressing mathematical concepts can exclusively be found for the target group of university students. Visualizing ideas or innovative social interventions to improve quantum learning is mainly found in schools while only a few approaches for further education show validated results. Tools most often examined in the studies reported were of digital nature, though some experiment-focused learning environments were also evaluated.